Thank you! I'm starting to feel better. We'll see if this takes care of it. I'll let you all know!
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Thank you! I'm starting to feel better. We'll see if this takes care of it. I'll let you all know!
So much for THAT. I put in the EP381 and I'm getting 38psi. Crap. The fuel filter looks good. I don't know where else to look. :cry:
ARGH!
<div class='quotetop'>QUOTE(adz55 @ May 15 2007, 01:30 PM) [snapback]93522[/snapback]</div>Quote:
Thank you! I'm starting to feel better. We'll see if this takes care of it. I'll let you all know!
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try to dead-head the fuel supply line and see how much pressure you get. You may have a bad fuel pressure regulator. That's the exact reason I like to use the Corvette internally regulated fuel filter.
<div class='quotetop'>QUOTE(RedHeartbeat @ May 15 2007, 05:47 PM) [snapback]93556[/snapback]</div>Quote:
try to dead-head the fuel supply line and see how much pressure you get. You may have a bad fuel pressure regulator. That's the exact reason I like to use the Corvette internally regulated fuel filter.
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Will do. I'm starting to suspect that now as well. That and my gauge is way off. I tested the fuel pressure on my dads '03 6.0 and it read 32psi on my gauge, and mine reads 38ish. Something is out of wack. I'm going to get another gauge.
Thanks
<div class='quotetop'>QUOTE(RedHeartbeat @ May 15 2007, 05:47 PM) [snapback]93556[/snapback]</div>Quote:
try to dead-head the fuel supply line and see how much pressure you get. You may have a bad fuel pressure regulator. That's the exact reason I like to use the Corvette internally regulated fuel filter.
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Ok, so if that does turn out to be the problem, how do I swap to the Corvette filter? Can I eliminate the factory regulator on the fuel rail?
You could but I wouldn't know how. I've got a feeling you've got a bad pressure guage in hand so fight that battle first.
I'm not sure about anything anymore.
My parents '03 1500hd with LQ4 ran 32psi on the gauge I was using, and runs perfect.
My '99 Lq4 runs 38 psi on the same gauge and runs like crap.
My friend checked his 2002 Suburban with 5.3 and it runs around 60psi. We checked with a different gauge. We then checked mine with the same gauge and it still was at 38psi.
We pulled the regulator to see if it was plugged or something. Everything was spotless.
One question; would the size and length of my fuel pump wiring drop the voltage significantly enough to put out less pressure than normal?
How do you have it plumbed from the tank forward? Does the fuel tank you are using have an internal fuel pressure regulator built into the tank assembly? Check the fuel pressure at the tank, at the filter and then at the fuel rail. You should not have any drop in pressure anywhere. From what I remember some vehicles actually have a FP reg built into the fuel pump assembly in the tank.
<div class='quotetop'>QUOTE(RedHeartbeat @ May 16 2007, 03:26 PM) [snapback]93718[/snapback]</div>It's plumbed with the factory hard-lines from the '96+ tahoe all the way to the fuel rail. 3/8" supply/ 5/16" return. I believe the pump output goes straight into the 3/8" line and I didn't see any regulator :(Quote:
How do you have it plumbed from the tank forward? Does the fuel tank you are using have an internal fuel pressure regulator built into the tank assembly? Check the fuel pressure at the tank, at the filter and then at the fuel rail. You should not have any drop in pressure anywhere. From what I remember some vehicles actually have a FP reg built into the fuel pump assembly in the tank.
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Pulled the coil harnesses one at a time on each cylinder. Each one seemed to make it run worse so it seems that each cylinder is getting some fuel, and (lots) of spark.
It's weird because it starts right away, and runs pretty smooth at idle, with only a hint of a vibration. It'll even rev up fairly well at idle, though the response time seems a little slower than it should be. When you put it in gear it starts to vibrate, and has no power, and will ping if you give it throttle quickly. It runs the same cold and at operating temp. :eek:
So, you're fuel rail has a pressure AND return line on it? All truck engines I have seen only have a pressure side. I preach the Corvette style regulated fuel filter to everyone and I have yet to hear a single complaint about fuel problems, other than the hose coming off the fuel pump because they used cheap hose or didnt' double clamp the connections. The Corvette fuel filter takes the 3/8" fuel pressure line into the filter and when it exceeds 58lbs returns it back to the tank through the 5/16" line. The opposite side of the filter continues the 3/8" fuel path to the fuel rail and it never sees the fuel tank again.