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Probationary Member
Mar 5, 2020
Paso Robles, California
So ive been battling a fuel pressure drop for a while, I finally started going thru items to test and check and I finally got it resolved!

i started by logging fuel pressure with link thru the factory MDP plug. Just a ebay 0-100psi sensor.

-changed my walbro 450 to a walbro 525 without check valve
-did the fuel siphon mod(2g gsx) 1/8” drill bit
-6an bulk head fitting with -6an line with adapter to oem hard line.
-tested the diaphragm on the afpr and opened it up and cleaned it.
-redid vacuum line straight from manifold to afpr
-replaced the relay for the rewire kit

and after everything i was still having a fuel pressure drop in boost. I finally decided to check my (aeromotive) fuel filter and it was a paper style and was old/dirty so i ordered a replacement micro glass filter cartridge and instantly my fuel base pressure climbed and no more fuel pressure loss in boost. So before going thru the headache of running a bulk head all the other little things everything check your fuel filter first.


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