Too much fuel pressure - The 1947 - Present Chevrolet & GMC Truck Message Board Network

69sinker · 08-06-2013, 07:46 PM

I have an 02 5.7 pulled from a camaro along with the camaro tank in my truck and had a line bust in the tank I replaced the line and checked the fuel pressure. Gauge read 85 lbs so I pulled the pump and replaced the internal regulator. Checked the fuel pressure afterwards and it was still 85 lbs, I even checked it with another gauge and still 85. Truck runs great but why such high pressure? I am in the process of running new lines but I'm wondering what to do about this?
I have 3/8 line with inline camaro filter and return line is from rail back to tank.
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ls1nova71 · 08-07-2013, 05:26 AM

You shouldnt have a return line from the rail on an 02 camaro LS1. You should have a feed line coming out of the tank, then to a "T" with one side returning to the tank and the other going to the fuel filter and then the rail. This is IF you have the LS1 Camaro tank. Is this how you have it run? Sounds like you're dead heading the bpump.
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BR3W CITY · 08-07-2013, 12:55 PM

x2, you shouldn't have an internal reg and still be running a return from the rail....it sounds like there is a weird mix of parts at work.

Camaro style has the on-sending unit regulator
Vette style would use the combo filter/regulator
Truck style has the on-rail regulator

...which are you running.

69sinker · 08-08-2013, 07:21 PM

Thanks for the replies. I have a line run from the purge solenoid to the return side of the tank. So yes I have it all wrong. So now what do I do with the purge solenoid?

Thanks, Dave
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BR3W CITY · 08-08-2013, 08:00 PM

Throw it away? Most of us aren't running any of the emissions stuff, barring the dudes in the Communist Republic of Kalifornia.

You can run a vented gas cap, or run a short vent line with a breather or check. You don't need to hook up all the evap stuff or a charc cannistor etc.

69sinker · 08-08-2013, 10:14 PM

Thanks for your help. I won't be running any emissions ...... For now, since I do live in the #2 rated communist state, Illinois.
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BR3W CITY · 08-08-2013, 10:51 PM

Hahah ya I have bench warrants there I think. They don't like me.

08-06-2013, 07:46 PM	#1
69sinker Registered User Join Date: Nov 2012 Location: eldred,il Posts: 503	Too much fuel pressure I have an 02 5.7 pulled from a camaro along with the camaro tank in my truck and had a line bust in the tank I replaced the line and checked the fuel pressure. Gauge read 85 lbs so I pulled the pump and replaced the internal regulator. Checked the fuel pressure afterwards and it was still 85 lbs, I even checked it with another gauge and still 85. Truck runs great but why such high pressure? I am in the process of running new lines but I'm wondering what to do about this? I have 3/8 line with inline camaro filter and return line is from rail back to tank. Posted via Mobile Device __________________ My 69 cst lwb 2wd LS1 swap 5.7/4L60e build http://67-72chevytrucks.com/vboard/s...d.php?t=589869

08-07-2013, 12:55 PM	#3
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Too much fuel pressure x2, you shouldn't have an internal reg and still be running a return from the rail....it sounds like there is a weird mix of parts at work. Camaro style has the on-sending unit regulator Vette style would use the combo filter/regulator Truck style has the on-rail regulator ...which are you running. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

08-08-2013, 07:21 PM	#4
69sinker Registered User Join Date: Nov 2012 Location: eldred,il Posts: 503	Re: Too much fuel pressure Thanks for the replies. I have a line run from the purge solenoid to the return side of the tank. So yes I have it all wrong. So now what do I do with the purge solenoid? Thanks, Dave Posted via Mobile Device __________________ My 69 cst lwb 2wd LS1 swap 5.7/4L60e build http://67-72chevytrucks.com/vboard/s...d.php?t=589869

08-08-2013, 08:00 PM	#5
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Too much fuel pressure Throw it away? Most of us aren't running any of the emissions stuff, barring the dudes in the Communist Republic of Kalifornia. You can run a vented gas cap, or run a short vent line with a breather or check. You don't need to hook up all the evap stuff or a charc cannistor etc. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

08-08-2013, 10:14 PM	#6
69sinker Registered User Join Date: Nov 2012 Location: eldred,il Posts: 503	Re: Too much fuel pressure Thanks for your help. I won't be running any emissions ...... For now, since I do live in the #2 rated communist state, Illinois. Posted via Mobile Device __________________ My 69 cst lwb 2wd LS1 swap 5.7/4L60e build http://67-72chevytrucks.com/vboard/s...d.php?t=589869

08-07-2013, 05:26 AM	#2
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,119	Re: Too much fuel pressure You shouldnt have a return line from the rail on an 02 camaro LS1. You should have a feed line coming out of the tank, then to a "T" with one side returning to the tank and the other going to the fuel filter and then the rail. This is IF you have the LS1 Camaro tank. Is this how you have it run? Sounds like you're dead heading the bpump. Posted via Mobile Device __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

08-08-2013, 10:51 PM	#7
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Too much fuel pressure Hahah ya I have bench warrants there I think. They don't like me. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

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