Well I installed my lift pump today and hopfully this will cure any air problems I may have had. It's hard to believe those little pumps will last 50 to 80K. I noticed they do get a little warm when they run. How hot will they get on a warm day. How does one decide when it's time to put in another pump? I guess I'll just put in a new one every 50K or so.

Blue Max,


Interesting observation on the pump getting warm.. I never thought to check that. Are you using the AC Delco pump? Had the truck been running for a while before you checked it? Since the Dmax recirculates excess fuel from the injectors, the fuel in the the tank can also get fairly warm. I had one of the AC pumps fail on my 98 K3500 6.5 at about 60kmiles. They stop pumping but will still flow fuel. It's a common failure the 6.5's. In past TDP discussions there was speculation that adding a filter in front of the pump would prolong their life. This is the main reason I added a stanadyne 30 micron pre-filter (http://community.webshots.com/photo/77018086/143154350CzJEWK) in front of mine. Also since adding the lift pump timer (http://community.webshots.com/photo/77018086/143154350CzJEWK) I can hear the pump running during the glow cycle so I know it' still working.


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Hey Bill, I just had the truck idling for 15 minutes or so and was laying under the truck to make sure nothing leaked. The pump gets a little warm not hot by any means. The lines in and out of the pump were cool and so was the return line. I have a 50 gallon transfer flow tank in the bed and filter all the fuel from that tank into the main tank and when I fill the truck it normally doesn't take much to fill the main tank. After the fuel goes round and round a few times and goes thru 3 filters I wouldn't think it would be to dirty. I may have to get another pump and cut it in half just to see how it works. My pump is an AC Delco EP309 and I am running with no bypass just for your information. Thanks for your help on some questions in another thread. I wired her up with 12 ga. wire so I shouldn't have any voltage drop and I put a waterproof plug like the factory uses for quick changes in the future. Thanks for your help, Mike-

Blue Max,
Would you post some info about your lift pump installation? I'm coming to the conclusion that I need one. So far I have had only one stall right after startup due to air in the KD Mega Filter, and I'd like to prevent further problems.

Thanks,
HBruns

Hey HB, my install is nothing special and I think if you look at JBPLOCKS install pictures and part lists you will have a very good idea of what you need to do. I did not install an oil pressure switch at this time but may do so in the future. ( I don't plan to crashhttp://www.dieselplace.com/forum/smileys/Big Smile.gif ) I had removed all the slip joint fuel lines on my truck along time ago so all I had to do was install the pump at the end of the rubber line and add a new piece of line on the down stream end of the pump and hook it back up to the existing steel fuel line. I did vary from what most of the guys are doing however by mounting the pump on the bottom of the cab by making a little aluminum bracket and strapping the pump on with a worm gear clamp. I used rubber between all of the metal parts to eliminate the possibility of unwanted vibrating sounds in the cab. I guess it worked because you can't here the pump at all and have to touch it to see if it is running. I mounted the pump where I did because I didn't want to cut the factory steel fuel line in case I ever wanted to return it to stock. It is not as pretty as some of the installs others have posted but it works well. I may change it later after the warranty runs out but I am expecting to have to have my injectors replaced and when that happens I will probably remove the pump before I take it in for repairs to help eliminate one point of warranty denial. I think my truck does run a little harder now with the pump installed but it could just be my imagination. If you have any further questions just ask but I think others have done nicer looking installs at this time and like I said I will probably change my pump location to inside the frame rail in the future when the warranty runs out unless I just get to lazy.http://www.dieselplace.com/forum/smileys/Big Smile.gif I had never had any fuel problems with my Mega untill a couple of weeks ago when pulling my trailor I had a high speed miss or something. After bleeding the air out a couple of times the problem has not returned but I don't want to have problems on the road so I installed the pump as insurance, time will tell if it was the right decision. I think that a pump should be used just for principal in the fuel system. Edited by: Blue Max