Question about 1998 GMC Sierra

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Question on fuel pressure

Driving down the highway couldnt go the speed limit .. thinking its low fuel pressure... whats the standard fuel ressure for a 1998 gmc sierra?

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  • Anonymous Mar 15, 2014

    Where is the fuel pressure regulator on a 1998 GMC Sierra

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Fuel pressure on a v6 or v8 is 60 to 66 psi

Posted on Feb 06, 2009

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My h23 dohc v-tec is surging could it be a clogged cadilletic converter


Very low possibility. More likely the fuel injector(s) are worn. They are good for only about 75,000 miles- their expected service life.

if they were recently replaced, check fuel pressure regulator- unplug the vacuum line, or put a gauge on the line and see if it has steady fuel pressure.

If it surges while driving- at highway speed, while throttle position sensor is a possibility- rule out the fuel system. If you have the MAPP sensor, make sure the atmospheric vent is clear, mason bees like these for nesting. If you ahve the Mass airflow sensor- back flush it with contact cleaner to clear the heater wire and the sensor.

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Vehicles: Any vehicle unable to achieve highway speeds.

I agree with your assessment - the fuel system is almost always the culprit when a vehicle cannot exceed a given speed.

Priority Checks: fuel pump function has gone marginal, fuel filter clogged, in-tank fuel strainer clogged, fuel pressure regulator failure, fuel rail leaking, fuel injector electrical harness/connectors loose, faulty fuel injector(s)

Secondary causes: CKP (crankshaft position sensor), CMP (camshaft position sensor), ECC (Engine Control Computer)

Tertiary Checks: Oxygen sensor(s), catalytic converter plugged

Faulty sensor(s) or ECC would cause immediate performance problems/speed limitations due to engine mis-timing. Whereas fuel system problems would limit the vehicle's performance by limiting the fuel available to the engine.
A plugged catalytic converter (or other exhaust system constriction) would limit engine performance by restricting the ability of the engine to properly exhaust.

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WHEN A CAR SHUT DOWN ON HIGHWAY OR FREEWAY.YOU CAN STILL HAVE FAULTY FUEL PUMP.IT COULD BE RUNNING BUT THE FUEL PRESSURE CAN BE TOO WEAK.THE 2.5 ENGINE FUEL PRESSURE IS 6.0 TO 7.0 PSI AND THE 3.3 ENGINE FUEL PRESSURE IS 37 TO 43 PSI. ANOTHER THING CHECK TO MAKE YOUR COOLANT IS NOT LOW.LOW COOLANT CAUSES ENGINE GET TOO HOT SHUT OFF.CHECK PVC VALVE AND EGR VALVE MAKE SURE THEY ARE NOT STUCK OPEN OR DISCONNECTED.AND MAKE SURE IDLE SPEED IS NOT TOO LOW YOU IDLE SPEED IS ON THE FACTORY STICKER UNDER THE HOOD.

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The owners manual should state, but you should be safe at speeds up to 45. I have a Tahoe and have driven in slush and snow up to the speed limit on highway. 4 Low should be on off road terrain only, you can cause serious damage if you drive in 4 low on pavement.

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I had the same problem. I changed my fuel filter too.Your catalytic converter is clogged. I could put the pedal to the floor board and couldnt hardly pick up any speed. I could hardly make up a hill on the highway. Take it to a kia dealership and they will, they should replace it for free, they did mine and I didnt have a warranty. I think there is a warranty on that specific part. That's what it is though.

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