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Old 11-14-2017, 01:53 AM   #9
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Join Date: Jul 2009
Location: Monterey/Falun

Originally Posted by Tfrasca View Post
So, I've had this Aeromotive FPR on my 142 since I did the engine swap. It's about 6 months old, I'd say.

It never help line pressure after the pumps primed, and the needle on the gauge always fluctuated up to 7-8 psi. I was getting my TLAO chips dialed in with my light blue (390cc?) injectors, but I couldn't escape a nasty lean condition under boost toward 5k rpm. Increased fuel pressure to 58 psi, and the FPR would BARELY get there. It should be capable of 30-70psi base pressure, so I took it apart to see what was up.

Sure enough, the hole that the ball valve should seal against was worn unevenly. They apparently just drill a hole, after the base is already anodized, and don't put a radius or chamfer on it. I used a counter sink bit and milled a chamfer on the seat by hand, carefully.

It seals much better now. Still leaks residual pressure after 10-15 seconds, but holds running pressure rock steady on the gauge. I've adjusted FP back down to 43 psi and am actually a bit rich at 12 psi with a 19t.

TL;DR - Be careful with these Aeromotive FPRs. Had I not installed a wideband when I did, I probably would have lost a piston...
What main pump are you running? what are you doing for wiring? do you have a inline check valve fitting on the pump. mine drops off pressure after i turn the key off like instantly but that is because no check valve on the pump and im using a in tank. base fuel pressure is at 38 in vacuum and doesnt run lean all the way up to 17psi
1979 Volvo 244DL 6.0/4l80e,8.8,Ms3x goldbox ecu and Mircrosquirt tcu, GTX4202r, 228/230cam, tbss intake, 11.4@123mph 9psi
1991 Volvo 245, Efan conversion, tcam, 4.10s, Aw71L
1982 Ford Fairmont Futura. 3sge Beams, j160 6speed, full aje suspension and tubular arms everywhere
1995 Porsche 993
Originally Posted by bricktop420 View Post
Thank you very much everybody... i now feel sufficiently retarded and will go cry in the corner...
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