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Old February 23rd, 2013, 12:38 PM   #141
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been busy. havent touched truck again. i had a squieky idler pulley so i got a new one. thats going on and let the cluster of figuiring this out continue.
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Old February 23rd, 2013, 03:46 PM   #142
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it has got to be a fuel delivery problem and until you put the correct pump in there you are wasting time, theres no reason to need 2 pumps.
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Old February 23rd, 2013, 04:14 PM   #143
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it has got to be a fuel delivery problem and until you put the correct pump in there you are wasting time, theres no reason to need 2 pumps.
But maybe three is the magic number

Has fuel pressure been tested? At idle and while giving it throttle?

What are you running for fuel lines? If you made them you could possibly have a blockage at the fuel injectors, I have seen that before when I made mine from cut to fit stainless jacketed FI hose. Using a cutoff wheel to make the cuts left debris in the line.


It might sound crazy but try a different battery. When I had FI issues on my Bronco I put a new battery in even though the auto parts store told me it was good. Ran tons better.
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Old February 23rd, 2013, 06:01 PM   #144
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it has got to be a fuel delivery problem and until you put the correct pump in there you are wasting time, theres no reason to need 2 pumps.
please tell me what the correct pump is.........
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Old February 23rd, 2013, 06:20 PM   #145
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alot of people run the following i know. its what wayne from alltech suggest
Bosch 044
Walbro GSL392
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Old February 23rd, 2013, 06:25 PM   #146
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have you checked the regulator to make sure it is correct and not bypassing when it shouldnt be
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Old February 23rd, 2013, 09:37 PM   #147
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When I had DBW problems it threw codes. Nick, what year is your engine? I have a spare DBW setup you can try if it's a 2002-2005.

I still believe it's fuel delivery since you could not get 60 psi out of a stock in-tank fuel pump. I have a spare pump you can try too. Is the in-line pump getting hot?

What are you using for a fuel regulator and how is it routed?
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Old February 23rd, 2013, 09:48 PM   #148
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stock fuel regulator on the rail. ive pulled the vacuum line like everyone says to test the regulator and it checks out fine. its a 2 line with return system.
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Old February 24th, 2013, 01:37 PM   #149
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The correct pump would be the factory fuel module. 03 Silverado with a return line will work. Even though you have one it sounds like its not working properly. Try another factory unit, that is going to be your best bet on this.
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Old February 26th, 2013, 04:08 PM   #150
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barn night tomorrow night if anyone wants to come over and help figure this out
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Old February 27th, 2013, 03:02 PM   #151
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last chance. someone come be my hero
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Old February 27th, 2013, 03:06 PM   #152
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Can you re-state how the system is setup? What pump, what lines, how its wired, etc. I remember you have the 5.3 regulator on the fuel rail, but other details are fading on page 8.
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Old February 27th, 2013, 03:09 PM   #153
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Trade for paintball equipment?
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Old February 27th, 2013, 03:36 PM   #154
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stock gm pump mounted in fuel cell. inline 6.0 stock fuel filter 6 inches after line exits fuel cell. then runs in 3/8 rubber injection hose about 4 ft along frame rail into an e2000 pump. then 3/8 rubber line up to motor. return line is also 3/8 rubber. stock regulator on rail.

stock pump im not 100% sure where its lead is coming from but its off the ignition and ecu. i have checked it before and it was getting full 14 volts. the inline pump i just ran off a relay and toggle switch on the dash.
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Old February 27th, 2013, 03:44 PM   #155
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I run a stock ac delco pump out of a late 90's gm 1500 truck with a corvette regulator because my fuel rail is the returnless style on a 5.3 with zero problems. In previous experance with my diesel I tried to run the stock intank pump, and piggy back another fuel pump on the frame rail to boost pressure and it did not work, raised a few pounds but truck would chug. If it was me I would get a good walbro or ac delco intank fuel pump instead of trying to make 2 inline work.
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Old February 27th, 2013, 03:49 PM   #156
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are you sure your fuel tank vent isnt plugged.
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Old February 27th, 2013, 04:26 PM   #157
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Quote:
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are you sure your fuel tank vent isnt plugged.
This or the cap is what I was thinking.
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Old February 27th, 2013, 04:42 PM   #158
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What type of scanner r u useing to collect data with? I have access to a solus pro and a modis
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Old February 27th, 2013, 05:10 PM   #159
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Torque on my phone. is what scanner im using. vent does not appear plugged
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Old February 27th, 2013, 05:19 PM   #160
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