Question on loosing fuel pressure going down track. - Page 2

Nick_Siebert · 01-21-2020, 10:44 AM

I had the exact same problem become present on my 305, Q Jet Camaro, it was a faulty pressure regulator at the carburetor.

rod butcher · 01-21-2020, 12:09 PM

A friend had this same problem this year and found it to be a very restricted fitting from tank to pump. This was after he changed pump and regulator. It was a 90 degree fitting.

Ed Wright · 01-21-2020, 12:32 PM

Is this a stock fuel tank? Not a fuel Cel?
To eliminate a weak (low volume) pump, I would add 5 gallons of fuel. If that stops the pressure drop, it will usually indicate the pump pick up being uncovered due to placement in the tank.

Jeff Stout · 01-21-2020, 05:24 PM

Quote:

Originally Posted by Ed Wright

Is this a stock fuel tank? Not a fuel Cel?
To eliminate a weak (low volume) pump, I would add 5 gallons of fuel. If that stops the pressure drop, it will usually indicate the pump pick up being uncovered due to placement in the tank.

It is a fuel cell with about 10 gallons in it mostly to make weight. Has rear sump and exit with pump directly behind it. Im pretty sure I 45 degree or straight fitted everything. I did install a -8 inline fuel filter when I built car 35 passes ago.

Mark Yacavone · 01-21-2020, 06:15 PM

It's the G force causing the problem.
;-)

Ed Wright · 01-21-2020, 07:10 PM

Quote:

Originally Posted by Mark Yacavone

It's the G force causing the problem.
;-)

How quick does it ET? And 60’?

Mike Pearson · 01-21-2020, 08:57 PM

What side of the pump is the filter. I have never ran a filter in my fuel system

Hacksaw · 01-22-2020, 09:17 AM

If you are using a fuel filter, check the Microns.

Jeff Stout · 01-22-2020, 10:31 AM

Quote:

Originally Posted by Ed Wright

How quick does it ET? And 60’?

1.88 60ft 14.50 ET.

Jeff Stout · 01-22-2020, 10:33 AM

Quote:

Originally Posted by Mike Pearson

What side of the pump is the filter. I have never ran a filter in my fuel system

I have the filter mounted near the passenger door. Pump is directly behind cell

01-21-2020, 10:44 AM	#11
Nick_Siebert Junior Member Join Date: Jul 2007 Location: Wamego, KS Posts: 38 Likes: 55 Liked 51 Times in 11 Posts	Re: Question on loosing fuel pressure going down track. I had the exact same problem become present on my 305, Q Jet Camaro, it was a faulty pressure regulator at the carburetor.

01-21-2020, 12:09 PM	#12
rod butcher Member Join Date: Dec 2005 Posts: 252 Likes: 297 Liked 132 Times in 27 Posts	Re: Question on loosing fuel pressure going down track. A friend had this same problem this year and found it to be a very restricted fitting from tank to pump. This was after he changed pump and regulator. It was a 90 degree fitting.

01-21-2020, 12:32 PM	#13
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: Question on loosing fuel pressure going down track. Is this a stock fuel tank? Not a fuel Cel? To eliminate a weak (low volume) pump, I would add 5 gallons of fuel. If that stops the pressure drop, it will usually indicate the pump pick up being uncovered due to placement in the tank. __________________ Ed Wright 4156 SS/JA

01-21-2020, 06:15 PM	#15
Mark Yacavone Veteran Member Join Date: Mar 2002 Location: Miles From Nowhere Posts: 7,809 Likes: 2,900 Liked 5,114 Times in 1,948 Posts	Re: Question on loosing fuel pressure going down track. It's the G force causing the problem. ;-) __________________ "We are lucky we don't get as much Government as we pay for." Will Rogers

01-21-2020, 08:57 PM	#17
Mike Pearson VIP Member Join Date: Mar 2007 Posts: 2,444 Likes: 613 Liked 1,916 Times in 574 Posts	Re: Question on loosing fuel pressure going down track. What side of the pump is the filter. I have never ran a filter in my fuel system __________________ Mike Pearson 2485 SS

01-22-2020, 09:17 AM	#18
Hacksaw Senior Member Join Date: Sep 2016 Posts: 881 Likes: 206 Liked 309 Times in 173 Posts	Re: Question on loosing fuel pressure going down track. If you are using a fuel filter, check the Microns.