No fuel pressure @ fuel rail - The 1947 - Present Chevrolet & GMC Truck Message Board Network

six8burban · 03-21-2013, 10:07 PM

I have no pressure @ fuel rail, dropped gas tank and connected pump to battery and it spends and sounds fine. Truck started without trans a couple of weeks ago and now that I have put it back in it won't turn over. Fuel filter and entire fuel system is new but has been sitting for about 7 years without any fuel in system. What else is there for me to check?
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.....might I add that I thought tank needed more fuel so when adding fuel it was getting stuck in filler neck? Waited 15 min and gas was sitting there and I could hear it dripping into tank. I squeezed filler neck and fuel went down only as I continuously squeezed? Dropped tank inspected filler neck and tank nothing seem to be clogged?

ls1nova71 · 03-21-2013, 10:35 PM

If you dropped the tank and powered up the pump and you can hear it running but you're not getting any pressure, it sounds like your hose between the pump and sender either blew off or has a good size hole blown in it. You'll have to pull the sender and check.

six8burban · 03-21-2013, 11:08 PM

Quote:

Originally Posted by ls1nova71

If you dropped the tank and powered up the pump and you can hear it running but you're not getting any pressure, it sounds like your hose between the pump and sender either blew off or has a good size hole blown in it. You'll have to pull the sender and check.

...the small hose in this pic? looks good.

six8burban · 03-21-2013, 11:13 PM

fuel tank wiring

rcrahn · 03-22-2013, 02:22 AM

Check the tank vent. When putting liquid in or taking liquid out a vessel you need a clear vent.

six8burban · 03-22-2013, 08:06 AM

Quote:

Originally Posted by rcrahn

Check the tank vent. When putting liquid in or taking liquid out a vessel you need a clear vent.

I have no vent....see pic, am I supposed to have one for gen 3 motor
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bohmankid · 03-22-2013, 09:56 AM

we probly need more info. are you checking the fuel pressure with a gage? you said the motor isn't turning over at all (not a fuel problem)? does the fuel pump turn on when you turn the key? have somebody in the truck turn the ignition on while you stand next to the tank to listen to the fuel pump to see if it primes.

six8burban · 03-22-2013, 10:19 AM

Quote:

Originally Posted by bohmankid

we probly need more info. are you checking the fuel pressure with a gage? you said the motor isn't turning over at all (not a fuel problem)? does the fuel pump turn on when you turn the key? have somebody in the truck turn the ignition on while you stand next to the tank to listen to the fuel pump to see if it primes.

Yes I'm useing fuel gage@ fuel rail. Yes fuel pump turns on by key. Yes I can hear pump come on. Motor fires with starting fluid
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Wasted Income · 03-22-2013, 10:51 AM

What regulator are you using? If it's one of those junk corvette regulator/filters, that might be your problem. I have had 2 that were bad right out of the box.

six8burban · 03-22-2013, 11:03 AM

[QUOTE=Wasted Income;5963460]What regulator are you using? If it's one of those junk corvette regulator/filters, that might be your problem. I have had 2 that were bad right out of the box.[/QUOTE
Regulator? If we are thinking the same thing then It's the stock regulator, I never changed it.
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Wasted Income · 03-22-2013, 11:35 AM

So I take it you're using the truck rails, with the regulator built in?

bohmankid · 03-22-2013, 12:47 PM

The fuel gage reads 0? I'd check the lines for blockage at that point. How new is the pump? I'm guessing the regulator in line after the fuel gage and isn't the problem, if you have the older motor with the regulator built in then.

BR3W CITY · 03-22-2013, 02:59 PM

You DO need a vent by the way. Normally it would trigger an emissions CEL but since emissions is usually deleted in a swap, it will just have random fuel hiccups/fill issues/stalling/boggin.

six8burban · 03-22-2013, 03:48 PM

Quote:

Originally Posted by BR3W CITY

You DO need a vent by the way. Normally it would trigger an emissions CEL but since emissions is usually deleted in a swap, it will just have random fuel hiccups/fill issues/stalling/boggin.

Can I just use a Vented gas cap?
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arider278j · 03-22-2013, 10:45 PM

Another poss is fuel line pinched between trans and motor. You said it ran before trans was installed. Just a thought

solidaxel · 03-22-2013, 11:30 PM

Disconnect the fitting (first connection) after the
tank (pump) and see if you have fuel and pressure.

BR3W CITY · 03-23-2013, 02:50 PM

Quote:

Originally Posted by six8burban

Can I just use a Vented gas cap?
Posted via Mobile Device

Sure can, anything is better than no vent. Mine only vents through the cap.

whitels1 · 03-23-2013, 07:35 PM

Mine vents through the cap also but on hot days and heated by the exhaust, there is some serious pressure in the tank, I'm in the process of hooking up the evap/purge to the ls stock status, but so far no drivability issues.

six8burban · 03-26-2013, 10:57 PM

Bad ground! Yup bad ground from engine to frame.....problem solved....thanks guys!
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03-21-2013, 10:07 PM	#1
six8burban Registered User Join Date: Feb 2005 Location: philadelphia pa Posts: 124	No fuel pressure @ fuel rail I have no pressure @ fuel rail, dropped gas tank and connected pump to battery and it spends and sounds fine. Truck started without trans a couple of weeks ago and now that I have put it back in it won't turn over. Fuel filter and entire fuel system is new but has been sitting for about 7 years without any fuel in system. What else is there for me to check? Posted via Mobile Device .....might I add that I thought tank needed more fuel so when adding fuel it was getting stuck in filler neck? Waited 15 min and gas was sitting there and I could hear it dripping into tank. I squeezed filler neck and fuel went down only as I continuously squeezed? Dropped tank inspected filler neck and tank nothing seem to be clogged? Last edited by six8burban; 03-21-2013 at 10:24 PM. Reason: More info

03-21-2013, 10:35 PM	#2
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,119	Re: No fuel pressure @ fuel rail If you dropped the tank and powered up the pump and you can hear it running but you're not getting any pressure, it sounds like your hose between the pump and sender either blew off or has a good size hole blown in it. You'll have to pull the sender and check. __________________ 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

03-21-2013, 11:13 PM	#4
six8burban Registered User Join Date: Feb 2005 Location: philadelphia pa Posts: 124	Re: No fuel pressure @ fuel rail fuel tank wiring Attached Images

03-22-2013, 02:22 AM	#5
rcrahn Registered User Join Date: Jun 2007 Location: The West Posts: 767	Re: No fuel pressure @ fuel rail Check the tank vent. When putting liquid in or taking liquid out a vessel you need a clear vent.

03-22-2013, 09:56 AM	#7
bohmankid Registered User Join Date: Nov 2012 Location: Salt Lake City, UT Posts: 520	Re: No fuel pressure @ fuel rail we probly need more info. are you checking the fuel pressure with a gage? you said the motor isn't turning over at all (not a fuel problem)? does the fuel pump turn on when you turn the key? have somebody in the truck turn the ignition on while you stand next to the tank to listen to the fuel pump to see if it primes. __________________ My 1985 GMC 4x4 LS swap build thread R.I.P. My 1978 Big Ten, Big Block build thread Moby: My Chevy 4x4 ls swap build thread

03-22-2013, 10:51 AM	#9
Wasted Income Boosted Member Join Date: May 2002 Location: Mackinaw, IL Posts: 2,200	Re: No fuel pressure @ fuel rail What regulator are you using? If it's one of those junk corvette regulator/filters, that might be your problem. I have had 2 that were bad right out of the box. __________________ 1972 2wd K/5 Blazer Turbocharged 370 LSx - 941 rwhp / 1093 rwtq 1969 Chevy K-10 L33 5.3 / 4L80E / NP241 / 4" lift 1964 Buick Skylark Twin TURBO 383 LS pro-touring project 2014 VW Passat TDI - Daily Driver Turbo diesel 2015 Sierra Denali HD Duramax Turbo diesel 2023 Ford Explorer ST - Twin Turbskis 2023 Ford F150 RCSB - Whipple Supercharged 2017 Polaris RZR Turbo 2014 Nor-Tech Center Console - Twin Supercharged Outboards *TURBO ALL THE THINGS!!*

03-22-2013, 11:03 AM	#10
six8burban Registered User Join Date: Feb 2005 Location: philadelphia pa Posts: 124	Re: No fuel pressure @ fuel rail [QUOTE=Wasted Income;5963460]What regulator are you using? If it's one of those junk corvette regulator/filters, that might be your problem. I have had 2 that were bad right out of the box.[/QUOTE Regulator? If we are thinking the same thing then It's the stock regulator, I never changed it. Posted via Mobile Device

03-22-2013, 11:35 AM	#11
Wasted Income Boosted Member Join Date: May 2002 Location: Mackinaw, IL Posts: 2,200	Re: No fuel pressure @ fuel rail So I take it you're using the truck rails, with the regulator built in? __________________ 1972 2wd K/5 Blazer Turbocharged 370 LSx - 941 rwhp / 1093 rwtq 1969 Chevy K-10 L33 5.3 / 4L80E / NP241 / 4" lift 1964 Buick Skylark Twin TURBO 383 LS pro-touring project 2014 VW Passat TDI - Daily Driver Turbo diesel 2015 Sierra Denali HD Duramax Turbo diesel 2023 Ford Explorer ST - Twin Turbskis 2023 Ford F150 RCSB - Whipple Supercharged 2017 Polaris RZR Turbo 2014 Nor-Tech Center Console - Twin Supercharged Outboards *TURBO ALL THE THINGS!!*

03-22-2013, 12:47 PM	#12
bohmankid Registered User Join Date: Nov 2012 Location: Salt Lake City, UT Posts: 520	Re: No fuel pressure @ fuel rail The fuel gage reads 0? I'd check the lines for blockage at that point. How new is the pump? I'm guessing the regulator in line after the fuel gage and isn't the problem, if you have the older motor with the regulator built in then. __________________ My 1985 GMC 4x4 LS swap build thread R.I.P. My 1978 Big Ten, Big Block build thread Moby: My Chevy 4x4 ls swap build thread

03-22-2013, 02:59 PM	#13
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: No fuel pressure @ fuel rail You DO need a vent by the way. Normally it would trigger an emissions CEL but since emissions is usually deleted in a swap, it will just have random fuel hiccups/fill issues/stalling/boggin. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

03-22-2013, 10:45 PM	#15
arider278j Registered User Join Date: Oct 2012 Location: foresthill. california Posts: 20	Re: No fuel pressure @ fuel rail Another poss is fuel line pinched between trans and motor. You said it ran before trans was installed. Just a thought

03-22-2013, 11:30 PM	#16
solidaxel Registered User Join Date: Dec 2002 Location: Cactus Patch So. Az Posts: 4,749	Re: No fuel pressure @ fuel rail Disconnect the fitting (first connection) after the tank (pump) and see if you have fuel and pressure. __________________ 53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42

03-23-2013, 07:35 PM	#18
whitels1 Registered User Join Date: Apr 2012 Location: Vegas Posts: 617	Re: No fuel pressure @ fuel rail Mine vents through the cap also but on hot days and heated by the exhaust, there is some serious pressure in the tank, I'm in the process of hooking up the evap/purge to the ls stock status, but so far no drivability issues. __________________ GoldyLS1 K20 Build My K10 Rock Crawler -Dave

03-26-2013, 10:57 PM	#19
six8burban Registered User Join Date: Feb 2005 Location: philadelphia pa Posts: 124	Re: No fuel pressure @ fuel rail Bad ground! Yup bad ground from engine to frame.....problem solved....thanks guys! Posted via Mobile Device



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