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Need to know the correct fuel pressure

What is the fuel pressure

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The fuel pressure on the 3.8 should be 48 to 55 psi. Good Luck

Posted on May 26, 2009


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My Mitsubishi Outlander 2004 has a tendency of jerking especially when climbing. Injectors and throttle have been served . What could be the problem. Some say it's the fuel pump. Please help

It could be a fueling problem like a weak pump or clogged fuel filter. The right way to check for that is to do a fuel pressure test. Many parts stores will rent or loan fuel pressure testers. If pressure is as specified by Mitsubishi, then you know the pump and filter is good, and the problem is somewhere else, possibly a Mass Airflow Sensor needs to be tested. Have you checked the air filter for being clean?

If unsure about the fuel pressure test, have a friend do it that knows how. It is easy, just connect the tester, turn key to on, not start, and check pressure. It should be at specification, then start engine and check pressure again. If both readings are correct, the pump and pressure regulator and filter are all okay. Here is a how-to:

Jun 16, 2015 | 2004 Mitsubishi Outlander

3 Answers

My 1989 camaro runs when I pour gas in the throttlebody but then dies when the gas runs out

I guess my first question is how do you know the injector has fuel ?
You would need to know if the injector is getting voltage and pulse from the computer, and if the fuel pressure is enough to allow the injector to spray.

Dec 13, 2012 | 1989 Chevrolet Camaro

1 Answer

2001 chevy blazer won't start, no fuel, replaced the filter, won't start, when primed runs until out of gas, I hear the fuel pump working, but no fuel, could the pump be bad and not enough...

Hi Ralph,
First let me say that Jeremy W's answer is absolutely correct.

However, I would like to take a moment to applaud you for your question. Most people would not bother to ask what the correct fuel pressure should be. YES! it is absolutely possible that the fuel pump motor could be spinning and not pumping fuel. This is WHY the fuel pressure should be checked, because this is the only true test that will tell you if your fuel pump is working correctly.

Then I would also like to add that if you find that the fuel pressure is correct, then this only eliminates your FUEL DELIVERY system. It does NOT eliminate your FUEL INJECTION system. It sounds pretty obvious that if it runs when you add fuel to the intake that the problem is definitely fuel-related though.

So if you find the fuel pressure to be OK, let us know and we can help you diagnose the fuel injection system.

You are going about this the right way---isolate the SYSTEM at fault first. Only then can you run pinpoint tests to determine the actual cause of the problem.

Drive on!

Dave (dttech)

Oct 18, 2011 | 2001 Chevrolet Blazer

1 Answer

Need to know correct fuel pressure range for a 1999 Ford E 150 with a 4.2L. Cannot find spec anywhere online.

30-45 PSI (Pounds per Square Inch)

Attach fuel pressure gauge test valve as to release the pressure in the fuel system, then place the open hose end into a suitable gasoline container. Now proceed to bleed down the pressurized fuel system. Close the test gauge valve and place the ignition in the on position, utilize a scan tool to energize the fuel pump. This will bring the system to a stabilized fuel pressure that can be visually verified on the gauge. Hope this helped and best wishes.

Sep 10, 2009 | 2002 Ford E-Series

1 Answer

95 grand cherokee limited stalls when stopping but restarts

ok you need to know what your fuel pressure is and needs to be these fuel injected cars need to have a min. amout of pressure to run correctly so have fuel pressure checked and it could possibly be the pump or a regulator

Aug 15, 2009 | 1995 Jeep Grand Cherokee

1 Answer


Hello coret_d_king: My name is Roger and i will give you some things to look at. First is the check engine light on? If so you need to address these problems first. You need to know what the codes are stored in the memory of the computer. You need to check the fuel pressure for the proper pressure. The correct pressure is 60-66 psi.key on engine off. If the pressure is not within these specs. then the fuel pump should be looked at. Also check the fuel filter. There could be a blockage. I would also have the catalytic converter checked. Should the converter become plugged. The engine can not breath. The truck will run better cold but as the engine warms up. The truck runs worse. Will surge and lack performance.
SHould you need further help please just ask. Please rate the answer you received as this is how we know you were given correct information. Thank You for using Fix Ya. Roger

Jul 06, 2009 | 1999 Chevrolet Silverado 1500

2 Answers

Correct fuel pressure on the 5.7 in my 1999 gmc 3500 van?

Check the TPS. If you code the ECU there might be a P121 stored in the OBD2 port. If tere is no code the a cloged converter will be your best bet.

Feb 19, 2009 | 1999 GMC Savana

3 Answers

Replacing fuel pump need to remove rear seat need to know how

First you will need to releave fuel pressure......

next remove the rear seat cushion to gain access to fuel pump access panel.....

Removing Fuel Pump....

Jan 29, 2009 | 2003 Mitsubishi Outlander

1 Answer


Fuel pressure should be around 40-44 PSI at idle, if u replace the pump the correct pump has preset pressure, if the pressure is to high then the regulator may be stuck, it is near the injectors on the fuel supplu rail.

Dec 30, 2008 | 1996 Chevrolet C3500

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