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Old 04-27-2008, 10:19 AM   #1 (permalink)
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vortec 7.4 fuel pressure regulator

I just did a vortec 7.4 engine swap and I am having problems with the fuel system it appears. When I push the clutch in to stop it wants to cut off. It is hard to start if the engine is warm, but not when cold. Last night I got close to home and it started running rough like it was missing then it cut off and would not crank. A shot of starter fluid gets it to crank, but then it dies again. The fuel pump is brand new (in-tank) and is the one for the donor engine. The fuel pump I can hear running. I'm going to put a gauge on it to see what pressure I have at the fuel rail, but from what I have read it seems like it could be the pressure regulator? One question I have is...where is the fuel pressure regulator on this engine (1997 7.4 vortec)? I don't want to take apart more than I have to in order to find it.
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Old 04-27-2008, 01:00 PM   #2 (permalink)
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ok I just hooked a gauge up to it. When I turn the switch and the fuel pump runs for two seconds it barely builds any pressure on the fuel rail. It isn't even building 10 lbs. Just replaced the fuel filter and that didn't make a difference.
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1989 GMC Suburban 1500, 97 vortec 7.4 with 0411PCM, 14b FF rear w/Detroit & discs, Dana 60 front, ORD crossover steering, SM465 (factory), 6" lift, 37" Nitto Mud Grapplers on H2 rims
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Old 04-27-2008, 02:09 PM   #3 (permalink)
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In tank leak? Bad fuel pressure regulator?
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Old 04-27-2008, 09:25 PM   #4 (permalink)
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Quote:
Originally Posted by Bubba_Jeep View Post
In tank leak? Bad fuel pressure regulator?
It was a bad fuel pump. The pump was only ran for two days and it just flaked out. The replacement pump actually sounds a little different than the other one so maybe it wasn't in the best condition to begin with. I would still like to know exactly where the regulator is on the fuel rail (The back I think?) and where the vacuum line for it hooks up.
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1989 GMC Suburban 1500, 97 vortec 7.4 with 0411PCM, 14b FF rear w/Detroit & discs, Dana 60 front, ORD crossover steering, SM465 (factory), 6" lift, 37" Nitto Mud Grapplers on H2 rims
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