Fuel pressure inconsistency run to run Aeromotive

Rusty Davenport · 03-29-2016, 09:38 AM

On my stocker build the first outing went great but with one catch.......from run to run the fuel pressure may be up or down 2-3 pounds. This is a textbook Aeromotive bypass system A1000 pump with Aeromotive regulator and all textbook fuel line sizes to work with carbureted engine in this case a Q-Jet. Before I start throwing a regulator or pump at it COULD it be a bad carburetor function ???? May sound crazy but the carburetor does control resistance to pressure doesn't it ???? Help please.

Dave Ribeiro · 03-29-2016, 10:04 AM

Try a couple different makes of fuel pressure gauges & make sure you check it while the car is running ... Compare with fuel pressure @ 1000' on a pass...

Rusty Davenport · 03-29-2016, 10:17 AM

A little further clarification----there is no difference in gauges of Autometer on the cowl and Aeromotive at the carb, they are consistent with each other. The car can sit still for an hour or the next day and have a different pressure everytime it is started and can be higher or lower from where it was at the last run. ??????

Mark Lewis · 03-29-2016, 10:25 AM

fuel cell vented? Or had one system on a Superstocker that the fuel line had gotten sliced where the fitting was put in and the liner was getting sucked in when a lot of pressure was on and collapsing the line.
Took awhile to find that one and it was on a carb system.

buzzinhalfdozen · 03-29-2016, 10:31 AM

You have the same system I run, what about voltage? Have a way of monitoring it, pump output will change with varying voltage.Merely a guess as I've never had that issue using their products.

Jim Kaekel · 03-29-2016, 10:53 AM

X2, three very good areas to look at.

1320racer · 03-30-2016, 07:29 PM

Quote:

Originally Posted by Rusty Davenport

A little further clarification----there is no difference in gauges of Autometer on the cowl and Aeromotive at the carb, they are consistent with each other. The car can sit still for an hour or the next day and have a different pressure everytime it is started and can be higher or lower from where it was at the last run. ??????

liquid(glycerin) filled gauge(s)?

https://aeromotiveinc.com/fuel-press...blem-solution/

Mike Taylor 3601 · 04-06-2016, 07:25 AM

Had customer pulled his hair out over fuel pressure,would be 6-7lbs. then next thing you now would be 2-3lbs then back. changed regulators 3X,checked pump out,looked OK,he bought a new aeromotive just like he had,same thing. He found out line was sucking together between tank and pump, just took him 2 weeks to figure it out.
Mike Taylor 3601

03-29-2016, 09:38 AM	#1
Rusty Davenport Senior Member Join Date: Jun 2005 Location: Nashville N.C. Posts: 505 Likes: 4 Liked 100 Times in 26 Posts	Fuel pressure inconsistency run to run Aeromotive On my stocker build the first outing went great but with one catch.......from run to run the fuel pressure may be up or down 2-3 pounds. This is a textbook Aeromotive bypass system A1000 pump with Aeromotive regulator and all textbook fuel line sizes to work with carbureted engine in this case a Q-Jet. Before I start throwing a regulator or pump at it COULD it be a bad carburetor function ???? May sound crazy but the carburetor does control resistance to pressure doesn't it ???? Help please. __________________ NHRA AND IHRA STOCK ELIMINATOR 2772

03-29-2016, 10:04 AM	#2
Dave Ribeiro VIP Member Join Date: Sep 2002 Location: Williamsburg, Va.---USA Posts: 1,827 Likes: 1,612 Liked 56 Times in 27 Posts	Re: Fuel pressure inconsistency run to run Aeromotive Try a couple different makes of fuel pressure gauges & make sure you check it while the car is running ... Compare with fuel pressure @ 1000' on a pass... __________________ Dave Ribeiro 1033 STK

03-29-2016, 10:17 AM	#3
Rusty Davenport Senior Member Join Date: Jun 2005 Location: Nashville N.C. Posts: 505 Likes: 4 Liked 100 Times in 26 Posts	Re: Fuel pressure inconsistency run to run Aeromotive A little further clarification----there is no difference in gauges of Autometer on the cowl and Aeromotive at the carb, they are consistent with each other. The car can sit still for an hour or the next day and have a different pressure everytime it is started and can be higher or lower from where it was at the last run. ?????? __________________ NHRA AND IHRA STOCK ELIMINATOR 2772

03-29-2016, 10:25 AM	#4
Mark Lewis Member Join Date: Apr 2006 Posts: 332 Likes: 56 Liked 186 Times in 39 Posts	Re: Fuel pressure inconsistency run to run Aeromotive fuel cell vented? Or had one system on a Superstocker that the fuel line had gotten sliced where the fitting was put in and the liner was getting sucked in when a lot of pressure was on and collapsing the line. Took awhile to find that one and it was on a carb system.

03-29-2016, 10:31 AM	#5
buzzinhalfdozen Senior Member Join Date: Sep 2006 Location: Bellevue Ohio Posts: 985 Likes: 0 Liked 12 Times in 9 Posts	Re: Fuel pressure inconsistency run to run Aeromotive You have the same system I run, what about voltage? Have a way of monitoring it, pump output will change with varying voltage.Merely a guess as I've never had that issue using their products. __________________ Joe Buchanan SS/BX 3117

03-29-2016, 10:53 AM	#6
Jim Kaekel VIP Member Join Date: Jul 2002 Location: Michigan Posts: 1,222 Likes: 134 Liked 498 Times in 104 Posts	Re: Fuel pressure inconsistency run to run Aeromotive X2, three very good areas to look at. __________________ Jim Kaekel 3836 STK

04-06-2016, 07:25 AM	#8
Mike Taylor 3601 VIP Member Join Date: Oct 2008 Location: Somerset,Ky Posts: 1,303 Likes: 198 Liked 116 Times in 48 Posts	Re: Fuel pressure inconsistency run to run Aeromotive Had customer pulled his hair out over fuel pressure,would be 6-7lbs. then next thing you now would be 2-3lbs then back. changed regulators 3X,checked pump out,looked OK,he bought a new aeromotive just like he had,same thing. He found out line was sucking together between tank and pump, just took him 2 weeks to figure it out. Mike Taylor 3601