Im having fuel pressure problems. My car cant maintain consistent FP settings.

It jumps from 15#s to 42#s.

I heard it may be the pulsator? What is a pulsator, what does it look like, does my car have it, how much is it?
thanks

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'92 Formula
305 TPI 5speed
1LE package
Mods: SLP headers,SLP catback,SLP air foil,ported plenum,Crane AFPR (42psi),MSD6AL,homemade cold air,K&Ns,3:73s,JET fan switch, Macewen white face gauges...ZZ9 cam (i still have to install it )

 

The pulsator is what connect the fuel pump to the fuel line in the tank. It is just a rubber piece w/ two inlets for the fuel line. It is possible that it may be lose and not sealing correctly.

I recently replaced my fp and did tryed to get the pick up closer to the bottom of the tank. In doing so, the pulsator was not sealing enough which in turn caused zero fuel pressure.

To be honest w/ you, seeing that a fp replacement is my most unfavorable job out of anything on this car (until I cut a access hole above my fuel tank ) I would replace the pump and isolator together. Furthermore, get one of those Walboro pumps. They are not that expensive. Check em out!
http://members.home.com/syclone/APE/fuelpump.html

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Michael Graeber

My Garage

1)83 Z-28 T-Top: Full cage, 9" w/ lad.bars, Midwest Engine Tech 406sbc,Strip Dominator, Demon Carb, Phase VI Chevy Bowtie heads, .630" Crower roller set-up, 1 3/4 coated Hookers 3" true dual exhaust th400, fuel cell & still not running

2)89 Formula WS-6 305 TPI Auto For the road: minor motor, more suspension stuff. MODS

 

Which pump do I need man?
The $93 one?
Thanks man


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'92 Formula
305 TPI 5speed
1LE package
Mods: SLP headers,SLP catback,SLP air foil,ported plenum,Crane AFPR (42psi),MSD6AL,homemade cold air,K&Ns,3:73s,JET fan switch, Macewen white face gauges...ZZ9 cam (i still have to install it )

 

When you install a new fuel pump just leave the pulsator OFF. Don't put it back on. It is not worth the risk and you do not need it.

Tim

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TRAXION's 1990 IROC-Z
Best Time = 12.244 @ 112.51mph (1.778 60' / 7.819@88.32mph in the 1/8)
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels.
Gunning for NA 11's after installing Hooker LT Headers and reducing weight.
-=ICON Motorsports=-
Moderator: PROM board at thirdgen.org

 

Thanks guys.

------------------
'92 Formula
305 TPI 5speed
1LE package
Mods: SLP headers,SLP catback,SLP air foil,ported plenum,Crane AFPR (42psi),MSD6AL,homemade cold air,K&Ns,3:73s,JET fan switch, Macewen white face gauges...ZZ9 cam (i still have to install it )

 

I would go with the $93 one. For 10 bucks more, it would be a good investment esp if you want to run a small NOS kit.

If you look at the link I posted, under the FAQ's it says to just replace the pulsator with a piece of HIGH PRESSURE fuel line and some hose clamps.

Good luck and have fun w/ the fuel tank removal. Just try not to rush it and take your time.

 

Thanks man.

Yes I'm very much looking forward to removing the fuel tank. yippy!




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'92 Formula
305 TPI 5speed
1LE package
Mods: SLP headers,SLP catback,SLP air foil,ported plenum,Crane AFPR (42psi),MSD6AL,homemade cold air,K&Ns,3:73s,JET fan switch, Macewen white face gauges...ZZ9 cam (i still have to install it )

 

The hose I ignored in my Borg-Warner pump kit had hose clamps that were of the old GM OEM style.. where you release tension on them by squeezing 'em with pliers. The up-side of those suckers is that they don't need to be re-tightened after a while, they do it on their own. Just something to keep in mind if the Walbro unit comes with these clamps- don't chuck them for the screw type.


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!