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6.2L Diesel Engine Discuss the 6.2 GM diesel engine & associated components.

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Old 01-01-2013, 11:58 PM   #31 (permalink)
D.Camilleri
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Do you have the two spin on filter set up? If you do, understand that fuel is sucked through the filter on the firewall and then pressure fed to the small filter on the back of the intake. Pull the firewall filter off and make sure it is totally full of fuel! Then try and start. If the problem happens again, pull the filter and check it, if it isn't full of fuel, there is an air leak allowing the fuel to return to the fuel tank and it will suck the upper part of the filter's fuel out. These filters can be a PIA especially if you are in the mountains 4x4ing and climb a steep hill will about 1/4 tank of fuel, you can suck air.
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Old 01-04-2013, 11:31 PM   #32 (permalink)
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Thanks for the info. Yes my truck does have the two spin on type filters.

I got under the intake and around the pump clean, and I put the intake back on tonite. I am going to hook a fuel line directly on the back of the IP with an electric pump and see if it will start. It may have a bad fuel transfer pump causing the air problem. The diesel guy here in town said he does not work on these pumps anymore. He did say that when the truck runs out of fuel it will rev some. That would explain my start, rev and then die problem.
Here is a better pic of the truck I took the other day:
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Old 01-05-2013, 03:07 AM   #33 (permalink)
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Dang, that body is in great shape! Wish I could find a decent one up here.

How many miles on it?
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1990 Suburban 1500 Silverado 4x4, in the shop is a possible 6.5? Turbo in the wings. Open plenum intake. 700 R4 Now Rebuilt + 241, NV4500+205 sitting in the shop. 10,000lb Trany Cooler With 10in pusher Fan and gauge. 8,000 LB Warn Multi Mount. TCC Lock up Control. 10's front and back, 60 front and 14 bolt rear real soon? 4" Lift and 31 10.50's. Many twisted drive shafts F&R. Manual and auto high idle. Heated Fuel lines. Enough lighting to make day light

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it would be nice if it could deflect a deer or a prius...
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Mine ate about 6ft of paper towel once. It idled funny for a minute, then let out one big black firey fart and smoothed right out.
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Old 01-05-2013, 10:02 AM   #34 (permalink)
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when you get air in the lines (such as when the system is being primed and there are still air bubbles) the rpms will go up but not anywhere near as high as redline. It may go up to 1500rpm+/-. By the sounds of it you were passed 1500 and climbing when you shut it down.
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Old 01-07-2013, 01:42 AM   #35 (permalink)
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Thanks. That truck was sold new at Fairway Chevrolet in Las Vegas. It has no rust, not even under the batteries. I also am going to get rid of the camper top.

Today I hooked up my electric fuel pump directly to the fuel input line on the back of the IP. I also ran a return line back to my fuel container I had on the floor by the truck. I then turned on the fuel pump. Next I tried to start the truck. Nothing. I looked at the return line coming from the top of the IP. There was no fuel there. I thought there should be fuel flowing from the return with the electric pump hooked to the IP. I tried again and still it did not try to hit and no return from the IP. I did not have much time this afternoon, so tomorrow I am going to remove a glow plug and see if there is any vapor when I turn the engine over. Any ideas?
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Old 01-07-2013, 02:55 AM   #36 (permalink)
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Yes, you should get excess fuel out of the IP if there is power to the IP fuel cut off solenoid.

I'd unplug the cold advance solenoid to free up the return system as the system works buy building pressure in the return line to advance the timing, when the motor warms up the GP inhibit switch opens and the CAS opens, allowing free flow back to the tank.

Besides the fact that a pump should go before the filter but besides that try these,
I'd go right to the IP return line nipple and see if your getting fuel there?
Is the elec pump loading down?
Have you cracked the line out of the elec pump to see if you have fuel?
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1990 Suburban 1500 Silverado 4x4, in the shop is a possible 6.5? Turbo in the wings. Open plenum intake. 700 R4 Now Rebuilt + 241, NV4500+205 sitting in the shop. 10,000lb Trany Cooler With 10in pusher Fan and gauge. 8,000 LB Warn Multi Mount. TCC Lock up Control. 10's front and back, 60 front and 14 bolt rear real soon? 4" Lift and 31 10.50's. Many twisted drive shafts F&R. Manual and auto high idle. Heated Fuel lines. Enough lighting to make day light

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Quote:
Originally Posted by happypunch View Post
it would be nice if it could deflect a deer or a prius...
Quote:
Originally Posted by Livelli View Post
Mine ate about 6ft of paper towel once. It idled funny for a minute, then let out one big black firey fart and smoothed right out.
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Old 01-07-2013, 09:27 AM   #37 (permalink)
D.Camilleri
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There is a rotary fuel valve attached to the linkage in the injection pump. When the fuel solenoid is energized, it allows the spring in the linkage to open the valve. When power is removed from the fuel solenoid, it overides the spring in the linkage and closes the fuel valve. If the valve is closed, no fuel can enter into the injection pump. With the key on, try removing the pink wire on the top of the injection pump. Do you hear a click? Next step would be to remove the top of the injection pump and check the linkage to make sure it isn't gummed up and to do a bench test of the fuel solenoid.
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