Fuel pump or pressure regulator w/video
10-10-2018, 07:44 AM
#1
Fuel pump or pressure regulator w/video Please help
99 trans am
bolt on car
stock pump
pings @ 4500 & noses over
2-3 degrees of KR
quick video of WOT fuel pressure test
loses close to 30psi
99 trans am
bolt on car
stock pump
pings @ 4500 & noses over
2-3 degrees of KR
quick video of WOT fuel pressure test
loses close to 30psi
Last edited by Forcefed2002; 10-10-2018 at 04:51 PM.
10-10-2018, 01:52 PM
#4
10-10-2018, 01:55 PM
#5
the alt has me curious because when cold it will do 13.7 (still lower than most cars at 14.4) and when it warms up it'll run at 12.5. Also my headlights have a faint flicker at night.
where do I get an upgraded brush set & is it a diy deal if I'm mechanically inclined?
where do I get an upgraded brush set & is it a diy deal if I'm mechanically inclined?
10-10-2018, 02:21 PM
#7
Did some Alt brush float reading. Not suggesting voltage isn't the problem, but as you see in video, pressure drop is in full effect as early as 4k rpm.
doesn't brush float happen at a higher rpm considering all my drive pulleys are of factory size?
doesn't brush float happen at a higher rpm considering all my drive pulleys are of factory size?
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10-10-2018, 08:38 PM
#8
Since you don't know if the fuel pump and/or fuel filter has ever been changed I would assume both haven't been changed - perhaps since new.
I would replace the fuel filter first. If you still have the issue then I would replace the pump with a Racetronix fuel pump kit. It's plug and play. Only difficult thing is whether to drop the tank or cut an access panel above the tank.
There is a filter in the tank too. It might be clogged and causing the restriction. You will find out as soon as you pull the pump. The kit comes with a new filter.
There is a connector (bulkhead connector) on the top of the fuel tank with wires that run into the tank to power the pump. That connector can fail too or restrict voltage if it has corroded. Low voltage can cause the pump to degrade performance. The kit comes with a new bulkhead connector. So make sure to replace it as well when doing the install. It's critical that the pump get maximum voltage to the pump else it will brown out, get hot and fail.
Lest we forget, the wiring in your car is now 20 years old.
There are tons of posts and video explaining in detail how to do the install.
The WS6 Store (a sponsor here) can probably get you the best deal and quickest service (ship time).
http://www.ws6project.com/user_stor/.../98-02-f-body/
I would replace the fuel filter first. If you still have the issue then I would replace the pump with a Racetronix fuel pump kit. It's plug and play. Only difficult thing is whether to drop the tank or cut an access panel above the tank.
There is a filter in the tank too. It might be clogged and causing the restriction. You will find out as soon as you pull the pump. The kit comes with a new filter.
There is a connector (bulkhead connector) on the top of the fuel tank with wires that run into the tank to power the pump. That connector can fail too or restrict voltage if it has corroded. Low voltage can cause the pump to degrade performance. The kit comes with a new bulkhead connector. So make sure to replace it as well when doing the install. It's critical that the pump get maximum voltage to the pump else it will brown out, get hot and fail.
Lest we forget, the wiring in your car is now 20 years old.
There are tons of posts and video explaining in detail how to do the install.
The WS6 Store (a sponsor here) can probably get you the best deal and quickest service (ship time).
http://www.ws6project.com/user_stor/.../98-02-f-body/
10-10-2018, 09:55 PM
#9
Since you don't know if the fuel pump and/or fuel filter has ever been changed I would assume both haven't been changed - perhaps since new.
I would replace the fuel filter first. If you still have the issue then I would replace the pump with a Racetronix fuel pump kit. It's plug and play. Only difficult thing is whether to drop the tank or cut an access panel above the tank.
There is a filter in the tank too. It might be clogged and causing the restriction. You will find out as soon as you pull the pump. The kit comes with a new filter.
There is a connector (bulkhead connector) on the top of the fuel tank with wires that run into the tank to power the pump. That connector can fail too or restrict voltage if it has corroded. Low voltage can cause the pump to degrade performance. The kit comes with a new bulkhead connector. So make sure to replace it as well when doing the install. It's critical that the pump get maximum voltage to the pump else it will brown out, get hot and fail.
Lest we forget, the wiring in your car is now 20 years old.
There are tons of posts and video explaining in detail how to do the install.
The WS6 Store (a sponsor here) can probably get you the best deal and quickest service (ship time).
http://www.ws6project.com/user_stor/.../98-02-f-body/
I would replace the fuel filter first. If you still have the issue then I would replace the pump with a Racetronix fuel pump kit. It's plug and play. Only difficult thing is whether to drop the tank or cut an access panel above the tank.
There is a filter in the tank too. It might be clogged and causing the restriction. You will find out as soon as you pull the pump. The kit comes with a new filter.
There is a connector (bulkhead connector) on the top of the fuel tank with wires that run into the tank to power the pump. That connector can fail too or restrict voltage if it has corroded. Low voltage can cause the pump to degrade performance. The kit comes with a new bulkhead connector. So make sure to replace it as well when doing the install. It's critical that the pump get maximum voltage to the pump else it will brown out, get hot and fail.
Lest we forget, the wiring in your car is now 20 years old.
There are tons of posts and video explaining in detail how to do the install.
The WS6 Store (a sponsor here) can probably get you the best deal and quickest service (ship time).
http://www.ws6project.com/user_stor/.../98-02-f-body/
I've ordered a fuel filter & in tank Delphi fuel pressure regulator as well as the Racetronix pump & hot wire kit from WS6 store. Will be sure to verify voltage at the pump upon installation. Have also gathered materials to do the big 3 electrical upgrade to the power/grounds under the hood.
10-11-2018, 04:41 PM
#10
maintains 58psi through 6k rpm
IM QUITE sure the pump had alot to do with it, but I also noted that the diaphragm of the original FPR was bad. I could blow though the reference hole both directions without resistance on the old one.
The new FPR I couldnt.
which brings me to another question.
what does the in tank oem FPR use as a reference pressure/vacuum to alter pressure? I mean it's just an open nipple in the fuel tank.?
I've seen that style FPR inside the plenum of a 4.3l Astro van & can understand how manifold pressure changes in the plenum can effect the regulator, but how does it work in the fuel tank, anyone?
10-11-2018, 06:19 PM
#13
TECH Senior Member
10-12-2018, 08:49 AM
#14
A suggestion.
Since the 1998 - 2002 fbody is now nearly 20 years old it perhaps should be a given that when replacing the pump the in tank regulator should be replaced as well.
IMO Racetronix might consider offering it as well in their kits, or literature at time of purchase, recommending it as optional giving the buyer a choice to replace or NOT.
The C5 external filter/regulator is an option as well, if you know about it. But it requires modification to the stock system by removing the internal FPR and replacing it with an external FPR in the filter assembly.
Good to hear you got yours fixed and are back on the road.
Since the 1998 - 2002 fbody is now nearly 20 years old it perhaps should be a given that when replacing the pump the in tank regulator should be replaced as well.
IMO Racetronix might consider offering it as well in their kits, or literature at time of purchase, recommending it as optional giving the buyer a choice to replace or NOT.
The C5 external filter/regulator is an option as well, if you know about it. But it requires modification to the stock system by removing the internal FPR and replacing it with an external FPR in the filter assembly.
Good to hear you got yours fixed and are back on the road.