choke adjustment on 7747

[hammertime371]

heres a napa part# DFP FE0110 seems a bit overkill but should work


a/f guage was around 12 -14 most of the way home today so i think that added 2 psi made a difference.

[EagleMark]

Half price on amazon...
http://www.amazon.com/Delphi-FE0110-...2&sr=8-1-fkmr1

[hammertime371]

wow good lookin out!!! ill order it right up

[hammertime371]

ok installed new pump in tank...its rated for 50psi but i still cant get more than 19. must need a another regulator spring. the 1 bought already was suppose to be 18-40psi. not sure whats wrong

[EagleMark]

Or your gauge is off? Try lightly pinching the return line while watching the pressure, it should skyrocket.

[hammertime371]

ill try it tommorrow... if it does than that means i need a stiffer spring?

[EagleMark]

If you got it all the way tight then yes. Does it come down if backed out?

An 18 to 40 PSI spring that only goes to 19 makes me wonder? IIRC all you can get from a stock spring is 18 PSI... your gauge could be off a pound if close to accurate.

[hammertime371]

it goes down to 14 when backed off... no different from the external pump setup...so perhaps i got a lame spring... although the new pump is silent.. that is nice. i compared the guage with others at work and out of 5 there was a small tolerence between them so i feel confident the guage is right...they are small and dont have fine division lines between 10 and 20psi so ya have to estimate...a digital 1 would be nice!

[EagleMark]

Wow, 5 gauges that are all within a pound? That is a record! You guys must all have good quality gauges. What kind are they? I've seen so many cheap gauges so far off it's ridiculas... I just spent $100. setting up a TBI fitting on 60 inch stainless braided line with AN fittings and a shock proof liquid filled race gauge so I can run up under wiper and watch pressure while WOT. My test gauge is within one pound of it.

Your pressures with that pump are what I have seen with stock spring an adjustable regulater...

[hammertime371]

they are made by clippard. not cheap.. they are for precision pnumatics systems. probly not legal for fuel purposes but for the 2 seconds it takes to check fuel pressure who cares... i dont leave it on while i drive incase it leaks. i got a vertical nipple sticken out of the fuel line so theres a bubble of air when i put the guage on so fuel dont actually touch the guage. almost like an isolation kit

[hammertime371]

pressure goes to 50psi when pinching the return line. so it has to be the spring. ill look around for another spring unless you know a place i can buy the right 1

[hammertime371]

i went back and checked my history from ebay and this is the part# of the spring i bought 260929050941 ... check it out it was suppose to be adjustable from 12psi to 40psi

[EagleMark]

Sounds like this spring which I have used to 23 PSI?
http://www.ebay.com/itm/GM-TBI-Fuel-...95593d&vxp=mtr

[hammertime371]

ya thats the same thing...same seller as well...maybe i have a leaking regulater diaphram

[EagleMark]

They very rarely fail and when they do you see gas, it would be leaking out of regulator, the can that holds the spring.

That spring is rated at those pressures for a stock regulator converted to adjustable. Read his other spring auction which says its 23 to 30 PSI for aftermarket regulators.