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How do you check fuel pressure regulator

Checked the fuel pressure. it read 55 lbs. ( needs 60 to 66 lbs. to start) I need to check the fuel pressure regulator next before I change out the fuel pump.

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  • richard lee Jan 16, 2013

    this is on a 1996 chevy tahoe 5.7 4wd

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  • Cars & Trucks Master
  • 5,332 Answers

If the pressure holds steady than the regulator is likely not the issue. It is very common for the fuel pumps to be the source of this issue. Many times you can start the engines with a shot of carb spray and the engine will continue to run after until you shut it off.

Get a quality fuel pump. Either a delphi or an A/C Delco. These pumps are worth the extra money as they are more reliable than most of the other aftermarket brands. One in particular to stay away from is a brand called Airtex.

Posted on Jan 16, 2013

Testimonial: "Really appreciated the help. I think we narrowed it down to the pump. Thanks a bunch."

  • richard lee Jan 16, 2013

    If I leave it the gauge pressured up, it starts to leak down after a little while. Does that sound like the regulator?? Or is that normal.

  • Jeremy W.
    Jeremy W. Jan 16, 2013

    If the regulator where bad you would see the pressure drop to zero within 2-3 minutes. I am pretty sure there are rubber lines on the fule lines under the vehicle on the drivers side near the transmission. If you find those you can genlty pinch off the return line (the one that does end up at the fuel filter) and turn the key to the run position (you do not need to start the engine). If fuel pressure does not go above 55 psi than its the pump.

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Check for a burned fusible link under the hood. If you have power at the fuel pump relay, you could have a bad ignition switch or bad oil pressure switch...accordianman

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When you hook the pressure test guage to shrader valve on fuel rail what it reads is what the pressure is from pump, around 60 p.s.i. all you need to do is hook up the guage and turn on key, you do not have to turn engine over, and if pump is good it will shoot up to 58 or 60 right now.

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PyroPCMan
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SOURCE: 98 blazer stalls

It could be your fuel pressure regulator, check this link for details:

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528022b9c4

8e44b4b.jpg That's what it looks like.

Posted on Feb 19, 2009

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Signs of a Bad Fuel Pressure Regulator
the vehicle will not start, if a bad regulator. Usually, this is a problem that is encountered in the morning when you start your vehicle. Many a times, the engine starts, but stalls shortly after starting. check the fuse and relay for pump. also remove line to fuel pressure regulator and if fuel in line, replace fuel pressure regulator. check for spark and also the timing belt. its one sign of not starting. if car runs fine on spray, I would not say its the timing belt or chain.

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You need 3 things.
Compression
Good hot blue spark to all plugs.
Good gasoline and proper fuel pressure. 63-64 lbs.
If you have all 3 then move on to injector pulse to all injectors.
I think each injector is on a separate driver on that one.
Check for pulse to all of them.

You may be weak on fuel pressure . even a couple of lbs low on a cold start will cause a no start.
Double check cold start cranking fuel pressure. If under 63-62 lbs you have problems.
one test is to give it a squirt of carb cleaner not starting fluid. If it starts then you have a fuel pressure problem.
Run the full fuel pressure test and post back pressures.
Here is the guide lines on testing.
Hard to start cold.
Check cold start fuel pressure.
Check engine running fuel pressure.
Check engine running on the road fuel pressure.
Then shut it off and watch for fast leak down.
Pinch off at rubber part or block off return line and check full pressure.
Later V6 and V8 gm engines should have 60-66 fuel pressure.
Cold start should be 64-65 lbs of pressure.
If you do not have full fuel pressure on a cold start the injectors will not squirt fuel.
Do not leave home without it.
Engine running should be 60-66 lbs pressure depending on engine load.
Full pressure with return pinched off should be 75-85 or more.
And if it has a fast leak down after shut off you have a leak.

The 75-85 is only a check on the capable full pressure of fuel pump.
If you can not find the rubber return line check full pressure by plugging return line or just or the true full pressure can be taken direct at the end fuel filter.
What are the pressure readings that you have done.
What are your cold start pressure readings?
Post back what you have.

The other thing to is when was the last time the fuel filter was replaced? The fuel filter may have got to the end of it's like and may need to be replaced, the fuel filer should be replaced every 15,000 miles or once a year to ensure the fuel system is running 100%.

Good luck and keep me posted, be glad to help you get your blazer running again soon.

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You need 3 things.
Compression
Good hot blue spark to all plugs.
Good gasoline and proper fuel pressure. 63-64 lbs.
If you have all 3 then move on to injector pulse to all injectors.
I think each injector is on a separate driver on that one.
Check for pulse to all of them.

You may be weak on fuel pressure . even a couple of lbs low on a cold start will cause a no start.
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Hard to start cold.
Check cold start fuel pressure.
Check engine running fuel pressure.
Check engine running on the road fuel pressure.
Then shut it off and watch for fast leak down.
Pinch off at rubber part or block off return line and check full pressure.
Later V6 and V8 gm engines should have 60-66 fuel pressure.
Cold start should be 64-65 lbs of pressure.
If you do not have full fuel pressure on a cold start the injectors will not squirt fuel. Do not leave home without it.
Engine running should be 60-66 lbs pressure depending on engine load.
Full pressure with return pinched off should be 75-85 or more.
And if it has a fast leak down after shut off you have a leak.


The 75-85 is only a check on the capable full pressure of fuel pump.
If you can not find the rubber return line check full pressure by plugging return line or just or the true full pressure can be taken direct at the end fuel filter.
What are the pressure readings that you have when done.
What are your cold start pressure readings?
Post back what you have. Good luck

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It could be your fuel pressure regulator, check this link for details:

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8e44b4b.jpg That's what it looks like.

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