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Old 11-14-2017, 01:05 PM   #23
brian smith
Board Member
Join Date: Nov 2010
Location: N.Y.

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.
I'm glad I saw this before installing mine. So what do we think, would a 60 degree taper countersink be better than a 45 degree for this?
the howdeedoo:
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