Attention Fuel Pump Installers

[Scoobum]

What size pump?

[tar baby]

255

[tar baby]

also I am running a hood mount auto meter Guage

[Scoobum]

Were you able to get it down to 43-44 line off? I'll assume you're using Erics chip.

[good2win22]

Mine shot up to 60 after installing a 340 Walbro. Couldn't turn it down. Had a case of of the Saginaw fitting blues. Hadn't heard of one shooting up with a 255 but anything is possible.  That first pic that brad posted showing where to cut the little vent window may be your solution or drilling out the Saginaw fitting to allow an increased volume of fuel to return to the tank.  Have you tried just adjusting the regulator to lower the pressure?

[tar baby]

I cut the rubber . adjusted the regulator . yes new chip and injectors.

[tar baby]

I'll post my scan master numbers when I get home ..

[Steve Wood]

I wonder how much restriction the vapor return line in the sender would create?

[Scoobum]

Tar Babys name is Dan...and he lives about an hour north of me. Dan...fill the guys in on your build. Last time I dropped by the car was stripped.

[tar baby]

well I took a 84 grand national apart and put it back together..  with an 87 intercooled engine . tried my hand at painting .. its a twenty footer ..lol but its altogether.. and now I'm chasing little problems like this fuel pressure issue ...

[Scoobum]

Was the fuel pressure normal with the old pump?

[tar baby]

iac 79-81
tps .50
af 07
lb 46
batt 13.6
int 124
bl 118-128
clt 180-200
ats 109
rpm 850
o2's 700-718

[Scoobum]

TPS should be 42 and the IAC should be 10-20. BLM should be steady at idle...not fluctuating. Steve has the writeup on his site to adjust the IAC and TPS.

[tar baby]

ok ill adjust them . but yes pressure was steady 43 pounds with old pump and injectors..

[Steve Wood]

sure sounds to me like you crossed the vapor return line with the fuel return line if you used a 255 pump