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2G Aeromotive FPR install. Vacuum source help

speckles

Probationary Member
6
0
Jul 4, 2009
Portland, Oregon
Ok so we got the FPr installed on my friends 2g GST, for the vacuum source do we need to use the vacuum control solenoid thing? or do we just bypass that and get vacuum from the manifold?
 

jeffo

Proven Member
380
15
Oct 28, 2008
Hobe Sound, Florida
The FPR solenoid is only used on hot starts, for the first 2-3 minutes, to help with vapor lock/fuel percolation issues. On some cars, all that hot fuel in the rail will make the car idle poorly for the first 15-30 seconds without the FPR solenoid.
I have often found that solenoid to be the source of restrictions that weren't allowing the fuel pressure to rise 1:1 with boost, so its usually better if you can get away without it.
keydiver
 

matthewdesigns

Proven Member
801
6
Dec 29, 2006
Colo. Springs, Colorado
Jeff helped me figure this very issue out after I got my chip from him/added my fuel goodies. I had that exact problem regarding pressure not rising 1:1. Just use the vac line from the mani to the fp solenoid for the new fpr, and loop a line b/t the two nipples on the soleniod. Don't disconnect the electrics or you could throw a CEL.
 
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