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Old 01-16-2013, 07:03 PM   #41 (permalink)
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there shouldn't be any resistance, it should free flow. down under the alternator the steel line connects to a hose that goes to frame, blow from there. if its got resistance, the return will pressure up and stall the engine or blow off return lines like you did. if your blowing from rubber connection at IP, its tied into the injector returns.

what year is the truck? my description is for the square bodies, the lines were routed different on the next generation
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well to make your pump retarded, you could let it hang out with me for a day
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Yeah Diaric, I gotta say, I'm afraid I'm going to have to give you an official warning on that.
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Old 01-16-2013, 07:06 PM   #42 (permalink)
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Whether the return is plugged past the injectors is important, but the fact that non of his injector returns spurt fuel is more important I think
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Old 01-16-2013, 07:27 PM   #43 (permalink)
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Whether the return is plugged past the injectors is important, but the fact that non of his injector returns spurt fuel is more important I think
first post is about stumbling with return hooked up and blowing off cap. that is answered by plugged return line. I'd ignore no fuel on one side's return till thats solved. the fact it runs means injectors get fuel, cracking is unnecessary
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1987 6.2l Jimmy , being restored,4" lift, 35 mudders 1993 W350 5.9 , custom stretched cab, duelly flatdeck
2001 VW TDI Jetta 4 door loaded 2001 VW TDI Golf 2 door swapped engine project
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well to make your pump retarded, you could let it hang out with me for a day
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Originally Posted by Hawkstrong View Post
Diaric wins thread derailment......
Quote:
Originally Posted by High Sierra 2500 View Post
Yeah Diaric, I gotta say, I'm afraid I'm going to have to give you an official warning on that.
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Old 01-16-2013, 07:52 PM   #44 (permalink)
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Yes it's getting fuel to the injectors or it wouldn't idle as smooth as it would. I did notice that when I blew air into the rubber hose off the injection pump that the injector return hoses filled with air,so I'm guessing that what I did was a waste of time. I'll try blowing air at the steel line next.
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Old 01-16-2013, 08:05 PM   #45 (permalink)
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The injectors need return fuel to lubricate. If it's run with no return fuel for any length of time you can say bye bye to the injectors. losing 4 brand new injectors is no fun
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Old 01-16-2013, 08:10 PM   #46 (permalink)
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i wont drive it this way. I just cant think of reason why fuel is not coming out of the returns on the injectors. Maybe the injectors are not getting enough fuel to them to even have return fuel?
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Old 01-16-2013, 08:15 PM   #47 (permalink)
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have checked if they return fuel rev'ed up?

if it idles smooth I'd figure it must be getting proper fuel
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1987 6.2l Jimmy , being restored,4" lift, 35 mudders 1993 W350 5.9 , custom stretched cab, duelly flatdeck
2001 VW TDI Jetta 4 door loaded 2001 VW TDI Golf 2 door swapped engine project
Quote:
Originally Posted by 4320diesel View Post
well to make your pump retarded, you could let it hang out with me for a day
Quote:
Originally Posted by Hawkstrong View Post
Diaric wins thread derailment......
Quote:
Originally Posted by High Sierra 2500 View Post
Yeah Diaric, I gotta say, I'm afraid I'm going to have to give you an official warning on that.
6.2 FACTS AND ANSWERS Click Here
My Restoration Thread Click Here
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Old 01-16-2013, 08:28 PM   #48 (permalink)
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Quote:
Originally Posted by Jace View Post
i wont drive it this way. I just cant think of reason why fuel is not coming out of the returns on the injectors. Maybe the injectors are not getting enough fuel to them to even have return fuel?
That's what I'm thinking. Have you tried opening the air bleed with the truck idling? If it starts to run poorly with the air bleed open, you have a fuel supply problem...pre IP.

I'm still interested in what happens when you crack the inj lines. Doesn't take long and it may have an unexpected effect

I think Diaric is right tho and you should also see if they start returning fuel with some throttle.
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'87 GMC R2500 380,000km
AM/FM Radio -rebar except for engine trans and misc suspension parts

'90 GMC R3500 srw 3+3 280 000kms
CD player that eats CDs
No matter what Dieselplace may say, I am not a diesel technician, nor expert or specialist. Just a cheap guy with old truck that needs to run

Last edited by smackzed; 01-16-2013 at 08:29 PM.
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Old 01-16-2013, 08:33 PM   #49 (permalink)
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The air bleed on the filter? If so, I changed that all out to a spin on fuel filter.
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Old 01-16-2013, 08:35 PM   #50 (permalink)
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When I crack the lines, fuel weeps out and the truck idles real rough
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