Bought a used GMC 2500 HD D/A last week. Got a dealer warranty with the truck. When I test drove the truck I noticed a surging idle and an erratic fule gauge. Had the dealer write it up so that those issues would be fixed without any deductible being applied. Fast forward to today. Ran some errands and when I came out to the parking lot there was a nice big puddle of fuel under the truck - at least a quart. Looked to be coming from the area around the front cross member but couldn't get eyes on it to see exactly where it was originating. Drove it home a few miles and let it sit. No leakage. But, when the rain dried from last night I noticed another spot where I had it parked overnight. Any ideas? Could an injector be getting stuck open intermittently dumping fuel into the crankcase and then out an overflow somewhere? I'm admittedly very much a newbie to this so please excuse me if that is a dumb suggestion. As of now it's going back to the dealer in the morning - I just would like to know what I should be looking for in the event I get one of those "Gee we couldn't find anything wrong with it" replies from the service department. I haven't dealt with these guys yet so my expectations are low, lol. Thanks.

Ok. Used the search function and found mention of this same problem as possibly being a fuel rail leak. Truck runs and drives fine other than the mentioned idle and fuel gauge issues. Still open to any other suggestion.

Check your oil dip stick, if fuel dumped into the crankcase you will be able to tell by the level, and smell of diesel if any did go in that direction.

Check your oil dip stick, if fuel dumped into the crankcase you will be able to tell by the level, and smell of diesel if any did go in that direction.





[smacking myself on the head for not thinking of that myself]

Dutch





There was some problems with the fuel rail pressure sensor leaking ... That is more than likely it ...Mine just let go it was obvious ...


The dealer should be able to correctly diagnose and repair ...


Mac

Thanks guys. I feel a bit better informed heading in to the dealership tomorrow.





Mac - Did you get any warning lights on the dash when it let go? Or was it business as usual?

Thanks guys. I feel a bit better informed heading in to the dealership tomorrow.





Mac - Did you get any warning lights on the dash when it let go? Or was it business as usual?





He had to give out 12 free car wash coupons...........http://www.dieselplace.com/forum/smileys/Confused.gif


Thttp://www.dieselplace.com/forum/smileys/HiHi.gifNY

Thanks guys. I feel a bit better informed heading in to the dealership tomorrow.





Mac - Did you get any warning lights on the dash when it let go? Or was it business as usual?








For me it was business as usual .... I have heard others have set codes tho ....


Mac

Could an injector be getting stuck open intermittently dumping fuel into the crankcase and then out an overflow somewhere?


This is one time I hate being right. Bought the truck on Wednesday, injectors go bad on Saturday. They stuck open and dumped fuel in to the crankcase. I am HATING life.

i had the big fuel rail leak when my truck was still stock:


http://www.wackywack.com/smokin_diesel.htm

Sorry to hear that Dutch110. I hope they get you fixed up no problem.


Steve

Thanks Steve (by the way, is that YZF-R1 user name motorcycle related?) I bought it from Jones GMC and that is who is doing the service work. Got a call from my salesman today and he told me he had talked to the service manager. He said "Don't worry, we will take care of it." Now all I need to do is find out if their version of "it" and my version are the same version. I want all the injectors replaced. I'm sure they are only going to want to replace the faulty ones. We shall see.

if it is from the injectors all 8 will be replaced acording to new tech bulliten.but external leaks are external. you said front cross member. to not get signals mixed are you talking the cross member behing the engine or below the engine. not in front near the front diff. if the leak is rearward of the motor. it sounds like a pump leaking of a fitting.

Patrick - The service department confirmed today it was several bad injectors sticking open and dumping fuel into the crankcase. When I first noticed it the fuel was dripping from the cross member behind the engine. My bad. I forgot there was another one closer to the front of the truck. Probably had something to do with my blood pressure being somewhat elevated at the time, lol.

Dutch110 - I hear that the Dmax man at Jones is pretty good and he also owns one. They have told me before that they have done "pretty many" injectors, so at least they should be well versed in the routine. Mine was built mid March '02 and no problems so far. I do however run a MEGA filter and FPPF Total Power every tank. I also purchased there.


Yes, I owned a '97 YZF1000R. They were built for 2 years and imported to the USA only in '97. The predecessor to the R1. I'm sure the most amazing machine I will ever have had the pleasure to own. Absolutely stunning technology for a measly 10 grand. However, I have a CDL, we have crappy roads, no tracks close by, and I just can't go down through Pequea at 175 mph. Nowhere to use it. Sold it and have a little Honda 600 Shadow to bop around the country roads on. A sport bike is just not comfy at 35 to 45 mph, and a passenger is out of the question for any length of time. (my wife) A female passenger on a road test of a sport bike in a magazine once said: "There are times when having your knees up at your ears are fun, but this isn't one of them."http://www.dieselplace.com/forum/smileys/Confused.gif


Steve

Steve - I agree with you on Jones. Just got off the phone with the service manager and they are replacing the injectors under warranty. The truck has over 100k on it so I am assuming they might be eating the cost on it. Either way they are treating me right and I will go back to them for service work in the future.


I race an R6 in WERA and am the Mid Atlantic Director for the Northeast Sportbike Association (NESBA.) NESBA runs track days all over the country. Wish you still had the Thundercat. I'd twist your arm into coming out with us.

The crancase vent is up front on the pass side. Probably spews out of there when the injectors "fillerup".

The good thing is the DMax handles the diluted fuel quite well and the turbos don't seem any worse for wear. Get the new injectors an love life.
Also make them replace the rail pressure control valve that's mounted on the high pressure fuel pump. It's also what causes a surging idle. 01's are known for it.


Dutch I was in Quarryville Sunday.Edited by: hoot

Hoot! What the heck were you doing in Quarryville on a Sunday?? Block shoot? Possum eating contest? I know the tractor pulls don't run on Sunday. http://www.dieselplace.com/forum/smileys/Big Smile.gif The wife and I have actually been looking to buy some property down that way. Still relatively undeveloped compared to the rest of the county. I used to belong to the gun club down there and shoot trap. It's right accross from the golf course, hehhehheh.


Good info on the surging idle. They are going to keep the truck for a few days and correct the other items on my "hit list" under warranty (surging idle and erratic fuel gauge being two of them.)

My brother lives accross from the golf course.

My brother lives accross from the golf course.


Best friend's brother in High School lived in that developmet. You were probably about 10 miles from my house.

His truck literally has golf ball dents.

Thanks Dutch110. I still have my leathers, etc. Now I wish I did still have the bike.


I think your truck will be OK. We'll have to get together sometime and compare notes.


Steve

Absolutely, Steve. If you ever want to get to the track and see what it is all about just let me know. Summit Point is close at 2.5 hours away. Pocono is about the same.


Truck update. The erratic fule gauge was a bad sending unit/fuel pump. The surging idle was the fuel rail sensor. All replaced under warranty. I think I need to count my lucky stars and put a secondary fuel filtration system on stat!

Well Dutch110, how's she run?


Steve

Awesome. I thought it was running ok before (what can I say I'm used to driving a big, noisy F-350 dually around - ANYTHING is quieter than that thing, lol) But it's now tons better. They even put a new container of FPFF (?) fuel additive on the seat for me. They didn't even make me pay the $100 deductible for the warranty work. Final tally: injectors replaced, fuel pump/sending unit replaced, power lock swtich replaced, oil change, and a coolant flush. Total charge - $0. Keep in mind that the truck has over 100k on it so this is all dealer warranty work. Just in time for me to go pick up the trailer and bikes this wekend in Reading and prepare for Pocono next week. If you get bored next Saturday, take a cruise up to Pocono raceway. It's a track day (not a race) bit it's still fun to watch the bikes go round and round.

Glad to hear it! Don the service manager called this evening to see how my visit went two weeks ago. I asked him about your's and he told me they finished it up. Said everything went well and you are easy to work with. Have fun next weekend at the track day!http://www.dieselplace.com/forum/smileys/Clap.gif


Steve


P.S. - FPPF Total Power I presume. I buy mine by the case from Kennedy Diesel, but I've found out it's very popular around here.Edited by: YZF1R

Sounds like you are all set and happy. Glad to hear it. Overall I think GM service is pretty darn good.

Don was great. I can't say enough about the service these guys put forth. Was I bummed that I bought the truck on Wednesday and had major issues on Sunday? Hell yeah. Last thing I need right now is a money pit in the driveway. I had planned on buying a newer truck with fewer miles on it after we had bought a new house this summer. But with the Suburban grenading a motor the week prior I was kind of forced into getting a truck sooner than I had planned for alot less then I was planning on spending. Was I also concerned that it was going to turn into a major hassle to get it taken care of? Most definitely. But they never even batted an eye. When I picked it up today the service guy laughed and said something along the lines of "You do realise that the waranty saved you a little over $3k in service work right?" All in all a bad experience turned good by a good service department. Now lets just hope this thing will hold together for another 100k......


ps - I was mistaken in the earlier post when I said that the fuel pressure sensor had gone bad as well. The surging idle was a result of the injectors going bad. Now how much do you think a stock Allison with 100k plus miles on it can withstand???? An extra 50 hp? I can see this is going to get expensive fast http://www.dieselplace.com/forum/smileys/Big Smile.gif

Guess what? Another big puddle of diesel fuel under the truck today. This is getting old........

Oh no! Keep us posted.


Steve

More bad injectors. Turns out the warranty company wouldn't foot the bill for all eight injectors last time around so they only replaced the four on the side that had the two that whent bad. Now two on the other side whent bad and they are going to replace those 4 now as well. Edited by: Dutch110

are they sure 100% are they somking you. if iuel is leaking as bad as fast that injector should not be hard to locate.I have seen pumps leak. internal and external.
external will fill the engine valley plum full of fuel and run back to the bell housing.

Yeah they said it was pretty weird as they did a balance test on the injectors last week before releasing it back to me. They showed me the results, and from what I had read on here, they all seemed to be in range. I drove the truck for almost two days with no leaks before the second one showed up. Either way, after all is said and done, all eight will have been replaced with the updated models.

are they sure 100% are they somking you. if iuel is leaking as bad as fast that injector should not be hard to locate.I have seen pumps leak. internal and external.
external will fill the engine valley plum full of fuel and run back to the bell housing.


Which pump Patrick? Fuel pump? Are their two? Internal and external? They had to also replace the sending unit last week, and I had thought that the in tank sending unit was married to the fuel pump as well? I would imagine if a fuel pump is bad I'll still have the leaking problem even after they replace the injectors?

there is no pump in the tank just a sendind unit. the injection pump is in the engine valley. behind the t-stat housing.also balance rates are just one tool not the answer to injectors.

Cool. Thanks for the education Patrick. I'll ask them if they checked the injector pump as well when I pick it up today.

And yet another update. Check engine light came on while on the way to work on Tuesday. Call up service and they tell me to bring it on in. Injector pump has gone bad now as well. So in the less then three weeks I have owned this truck I have replaced all eight injectors, the sending unit, and an injection pump. This is getting beyond frustrating. I have owned the truck for three weeks and have driven it for less than one of those three weeks. So what next?? It appears I have a Duramax with a basket case for a fuel delivery system. What will be next on the list of sh*t to go bad on me? Fuel rail pressure sensor? Sorry had to vent. So far this is the best truck I love to drive and hate to own all at the same time.

Well Dutch110, I just don't know what to say.http://www.dieselplace.com/forum/smileys/Ermm.gif Very frustrating. On the bright side, with the pump replaced, that should eliminate any problem with loopy idle that some '01's had. I was wondering how you were making out. Let's hope a new fuel system will take care of all problems. As long as the engine fuel lines are clean, you should be good to go. Keep us posted.


Steve

Your problem sounds like the injector pump housing maybe leaking....it leaks into the valley and runs off the back of the engine, this problem may or may not set a DTC...as stated above there is a crankcase vent oil seperator on the front right of the engine, but if it was comming out of there the whole under carriage would be dripping with oil/fuel. leaking fuel pressure regs are very sensitive to leaks and will set a DTC. Another poss. is the fuel return line where it bolts to the external side of the head, on the right head it is behind the fuel pressure tap on the left head it is behind the glow plug controler...


hoped this helped......as far as the warranty goes all 6.6-6.5 diesels


have a 10year 100k mile $100.00 deductible engine warranty...some


components on the engine are not covered but the major ones are.

......as far as the warranty goes all 6.6-6.5 diesels


have a 10year 100k mile $100.00 deductible engine warranty...some


components on the engine are not covered but the major ones are.








I think you mean 5 year 100k mile.

Thanks guys. Originally the problem manifested itself as leaking fuel and oil coating the under carriage (just like gmworldclassmaster describes.) The shop diagnosed it as faulty injectors and ended up replacing them all. This time around there was no fuel/oil leakage - just the service engine light. The truck has 100k on it so it is under dealer warranty and not manufacturer warranty. I have talked to the sales manager about extending that warranty based on my recent experiences and he seems agreeable. I really do like this truck alot. First time towing with it was this past weekend and it hauled like a champ. I was grinning from ear to ear the whole way to the track. Time will tell and hopefully I'll be on here a year from now joking about this with 150k on the clock.

<TABLE cellSpacing=0 cellPadding=5 width="100%" bgColor=beige border=1>
<T>
<TR>
<TD width="50%">60/100000 GM DIESEL ENGINE IN LIGHT DUTY VEHICLE WITH $100 DEDUCT AFTER BUMPER TO BUMPER </TD>
<TD width="10%">
<CENTER>01/03/2002 </CENTER></TD>
<TD align=right width="15%">19 miles </TD>
<TD width="10%">
<CENTER>01/03/2007 </CENTER></TD>
<TD align=right width="15%">100019 </TD></TR></T></TABLE>


I STAND CORRECTED 6.6 HAS THIS WARRANTY THE 6.5 HAS THE WARRANTY BELOW.


<A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1406772&amp;pubid=147&amp;evc=sm#ss2-1406772" target="_blank">
<H5>Special Policy Adjustment</A></H5>


This special policy covers the condition described above for a period of eleven (11) years or 120,000 miles (193,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. Damage from poor quality or incorrect grade diesel fuel, and gasoline or water contamination, is not covered under the terms of the 6.5L diesel warranty.


The pump repair or replacement will be made at no charge to the owner. This special policy applies ONLY to electronic diesel-fuel injection pump repairs and/or replacement as a result of injection pump failure.


and has the same 60/100,000 mile $100.00 deductible on the engine


same as the 6.6L