Question about 1993 Buick Park Avenue

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Low pressure at the fule rail, changed out the pressure relay and the fuel filter, still low pressure

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If you getting low fuel pressure after changing out the fuel filter and the pressure regulator, than the fuel pump may not pump correct amount of pressure. being 1993, the pump has age along and have run many miles, may have gotten weak and not pumping correct mount of psi.

Posted on Oct 04, 2009

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What does it mean when no fuel comes out of the fuel pressure regulator but there is fuel in the fuel rail?


fit a fuel pressure gauge and flow meter in the fuel line if the pressure is low replace the pump,if the flow is low replace the fuel filter, if the fuel pressure is high replace the fuel rail pressure regulator.

Jan 03, 2016 | Cars & Trucks

1 Answer

Removed lines blew out front line, seemed like there was something blocking it. Some fuel in the rails but hardly anything. The relays are all working. Changed one. Have to put it back


Have you checked your fuel filter. If not then just replace this should solve your problem. Additionally check fuel pump pressure. If low then replace fuel pump as well as fuel filter

Sep 20, 2015 | Cars & Trucks

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Wen u disconect fule fillter n turned motor over and petrol came out but no real fast is that the pump gone


turning an engine over to check fuel flow only works on engines with mechanical fuel pumps
all electric pumps should produce full flow as soon as the ignition is turned on
if you have a efi car then have the fuel pressure checked at the fuel manifold as that will show a faulty pump, regulator problem or blockages to vents or hoses.

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First check there is battery voltage to the pump and the pump starts when the ignition is switched on , if not check fuse and relay, check wiring from relay to pump. If ok and the pump is working , check for fuel blockage from the tank inlet to the pump , some have a sock type filter in the tank pick up tube, if all ok remove the fuel filter , switch on and fuel should flow at the filter, fit a new filter, if still no fuel at the rail fit a fuel pressure gauge an check for low pressure , if ok, the fuel pressure regulator may be stuck causing a air lock replace it.

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1 Answer

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Apr 14, 2013 | Cars & Trucks

1 Answer

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I'm not aware of a fuel pressure sensor, you have a fuel pump relay and inertia switch that powers the pump, and a fuel pressure regulator on the fuel rail. If there is a fuel pressure sensor, I would think it would be on the fuel rail with the injectors.
Have you replaced the fuel filter and checked the fuel pressure with a gauge ?

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Code p0191


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Kia mentor 1997 will not start have tried new coil, spark is alright but yet wont fire


If you have spark, then the next thing to look for would be fuel to fuel rail and good pressure, if low pressure, change fuel filter, check for faulty fuel pressure regulator and check fuel pump relay. If you are getting good fuel pressure, the next thing to look for is a faulty sensor

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