Unstable Fuel Pressure

CyberCop · 04-04-2002, 05:33 PM

I have recently added a 255LPH fuel pump on my 199 Mustang cobra 4.6 4V, as part of a supoercharger upgrade. None of the other modification have been installed except for the pump. When I driver the car, I get radical fuel pressure fluxuations from 35-60 lbs under load.

Is this normal??? Does a chip fix this???

Thanks!

vtec8ter · 04-09-2002, 06:30 AM

does you car idle fine? when i was having problems with my speedpro. my fuel pressure was fluctuating. i got a NOS fuel pressure gauge and installed it right on the fuel pump. with 83# injectors and speedpro work. problem solved.

SLOW 97 · 04-09-2002, 09:14 AM

A chip may help. Or you can get an adjustable fuel pressure regulator which might remedy the problem. It could be a bunch of things though like logged fuel rail, dirty injectors, bad O2 sensors, or just bad gas. It proably is just one of those problems that is just annoying not very serious.

04-04-2002, 05:33 PM	#1
CyberCop Registered Member Join Date: Apr 2002 Posts: 1	Unstable Fuel Pressure I have recently added a 255LPH fuel pump on my 199 Mustang cobra 4.6 4V, as part of a supoercharger upgrade. None of the other modification have been installed except for the pump. When I driver the car, I get radical fuel pressure fluxuations from 35-60 lbs under load. Is this normal??? Does a chip fix this??? Thanks!

04-09-2002, 06:30 AM	#2
vtec8ter Registered Member Join Date: Mar 2002 Location: EAST COAST Posts: 133	does you car idle fine? when i was having problems with my speedpro. my fuel pressure was fluctuating. i got a NOS fuel pressure gauge and installed it right on the fuel pump. with 83# injectors and speedpro work. problem solved. __________________ rice... the perfect meal anytime!!! MMMMMMmmmmm good!!! anyone wanna part with a late 80's GT? i want a new project car. somm to play with. PM me. please.

04-09-2002, 09:14 AM	#3
SLOW 97 Registered Member Join Date: Feb 2002 Location: Arlington Heights,IL Posts: 231	A chip may help. Or you can get an adjustable fuel pressure regulator which might remedy the problem. It could be a bunch of things though like logged fuel rail, dirty injectors, bad O2 sensors, or just bad gas. It proably is just one of those problems that is just annoying not very serious. __________________ '97 Laser Red GT Coupe Stock 2V (Pulled Silencer) 4R70W Automatic Ripped off a BLISTERING 15.37@90MPH With a 2.21 60ft Just Installed- K&N Air Filter Coming Soon...... -4.10's -Flowmaster A/T or Magnapack Cat-Back

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