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Re: Aeromotive Fuel Pressure Issues? LONG
[Re: galen]
#667379
04/13/10 08:13 AM
04/13/10 08:13 AM
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Joined: Jan 2003
Posts: 4,573
...gently down the stream
LAR_414
master
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master
Joined: Jan 2003
Posts: 4,573
...gently down the stream
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I've got the same crazy stuff going on, but with Mallory 140 pump. I've tried both of my pumps and a brand new regulator, and all new lines from front to back. Even have different carb on it now. Same thing!
Preasure can be fine one moment and next it is low, or high. Set the regulator, and then it will be different again, in 5 minutes. Not just a pound or so, but 2 or 3 pounds different. And no, it's not the guage!!!!! Guage is mounted 4 feet from the engine, where I can see it, too.
I'll try my holley blue pump next....maybe my mallory pumps are just worn out?
I give up!
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Re: Aeromotive Fuel Pressure Issues? LONG
[Re: LAR_414]
#667381
04/13/10 09:11 AM
04/13/10 09:11 AM
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Joined: Jan 2003
Posts: 2,924
A shed in England
Tig
master
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master
Joined: Jan 2003
Posts: 2,924
A shed in England
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I've seen this (not on my setup) It was stuff in the system, debris was from old fuel cell foam breaking down. HTH's 
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: Aeromotive Fuel Pressure Issues? LONG
[Re: LAR_414]
#667382
04/13/10 09:29 AM
04/13/10 09:29 AM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
I've got the same crazy stuff going on, but with Mallory 140 pump. I've tried both of my pumps and a brand new regulator, and all new lines from front to back. Even have different carb on it now. Same thing!
Preasure can be fine one moment and next it is low, or high. Set the regulator, and then it will be different again, in 5 minutes. Not just a pound or so, but 2 or 3 pounds different. And no, it's not the guage!!!!! Guage is mounted 4 feet from the engine, where I can see it, too.
I'll try my holley blue pump next....maybe my mallory pumps are just worn out?
I give up!
]
I'm betting cavition, gas is very hard to suck and pump and changes with temperture. Most installations don't have a large enough inlet line or are configured wrong to insure against cavition. My 
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Re: Aeromotive Fuel Pressure Issues? LONG
[Re: RyanJ]
#667383
04/13/10 09:30 AM
04/13/10 09:30 AM
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Joined: May 2006
Posts: 1,260
New Mexico
Adobedude
pro stock
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pro stock
Joined: May 2006
Posts: 1,260
New Mexico
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10-micron filter before the pump is too small, it'll lead to cavitation.
100-micron before the pump, 10-micron after.
Don't ask me how I know.
2001 Dodge Dakota
408 All Motor
11.27 @ 117.83 mph
2017 NM Mopar Challenge Series Champion.
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Re: Aeromotive Fuel Pressure Issues? LONG
[Re: Tig]
#667384
04/13/10 09:31 AM
04/13/10 09:31 AM
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Joined: Dec 2006
Posts: 3,667
Arizona
Chris'sBarracuda
master
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master
Joined: Dec 2006
Posts: 3,667
Arizona
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You might check to see if the vent is clogged. Just something from Aeromotive website.  Also here is something else that Aeromotive discusses in one of their Tech bulletins. http://aeromotiveinc.com/2010/01/fuel-filtration/They frown on pre pump filters. I know that when Kyle was there he told me NOT to use any filter before the pump. I filter the fuel as I put it in the tank. I have the A-2000 pump set @ 25 psi at the pump bypass, then regulate it down with the A-4 regulator.  HTH's.. Chris... 
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Re: Aeromotive Fuel Pressure Issues? LONG
[Re: Chris'sBarracuda]
#667385
04/13/10 09:36 AM
04/13/10 09:36 AM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
You might check to see if the vent is clogged. Just something from Aeromotive website.
Also here is something else that Aeromotive discusses in one of their Tech bulletins.
http://aeromotiveinc.com/2010/01/fuel-filtration/
They frown on pre pump filters. I know that when Kyle was there he told me NOT to use any filter before the pump. I filter the fuel as I put it in the tank. I have the A-2000 pump set @ 25 psi at the pump bypass, then regulate it down with the A-4 regulator.
HTH's..
Chris...
Pretty much what I have been saying, no filter before the fuel pump. Strain the fuel while adding to the fuel cell and never leave the cap off for long.
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