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I got a 96 tahoe . Fuel pressure is low at 40 psi . If the pump is bad should the pressure drop when checking it after a few min

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  • 75 Answers

You could try replacing the fuel filter.

Posted on Oct 19, 2013

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SOURCE: 2002 gmc yukon, rich fuel code, low fuel pressure @40

you may have two oxugen sensors on your yukon. if so the oxygen sensor that controls that bank may be bad. from what you mentioned in your complaint, it sounds like it is the oxygen sensor.

Posted on Dec 24, 2008

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SOURCE: fuel pressure problem.I replaced the fuel pump on 2001 chevy s-10

Most fuel injected vehicles have a relay that controls the fuel pump so after the ignition switch has been on for about 5 seconds and the engine is not running, the fuel pump automatically shuts off.
I don't know what your original problem was, but I think if the car runs normally, you have probably fixed your problem. If you don't have a manual, you can probably go to the library and take a look at a manual that covers your vehicle.

Posted on Jan 16, 2009

emissionwiz
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SOURCE: low fuel pressure 95 volvo 940 turbo

fuel pump check valve doesn't cause pressure loss, just hard starting cold, the check valve is part of the fuel pump, so to replace the valve u must replace the pump. do not use anything but the orig style pump, here is the part number from THE OE PUMP MAKER AT www.rockauto.com
DELPHI Part # FE0071 PRICE $124.99

Posted on May 05, 2009

jeffbvegas1
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SOURCE: 96 Tahoe no Cold Air

Yes... you are most likely low on freon as the compressor will cut on low pressure before vacuum.Depending on ambient temps and head pressures your running ,you may see low side pressures at 50. Automotive refrigerant (134a) is not far from matching the degress to low pressure....for instance 50 lb low side pressure will give you approx 60 degrees cooling at the vent.Once cabin temperatures are met is when you can expect that suction pressure to lower and stabilize.You would be better off watching high and low pressures to get the full picture of whats going on here...good luck

Posted on Jul 22, 2009

  • 3600 Answers

SOURCE: FUEL PUMP MAKES NOISE PRESSURE GAGE READS 40 PSI

Fuel pump is bad. At idle pressure should read 50 PSI. Replace with original manufacture fuel pump after market pumps will burn out fast and are unreliable from my experience. Also could have a bad fuel regulator but that only works while driving down the road full throttle. You can unhook the fuel rail pressure regulator and that will give it full fuel and the pressure reading should read 60 PSI while it is running. If you turn the engine off and turn the key to run position it should read 50 PSI and hold for 60 seconds, if it drops below 30 PSI after 30 seconds Pump is defective. Many pumps are going bad here of late as people have been running them less than ¼ tank and this kills the pump. The fuel cools and lubricates the pump so the lower the fuel level the worse it is on the pump below ¼ tank. Not to hard of a job to do if you want instructions let me know.

Posted on Sep 28, 2009

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1 Answer

Fuel is dropping about 5to7 psi in a few min is it still fuel pump holds at about 35


If the fuel tester is leaking, your pressure reading is likely to be low.
If you have 35+ psi. Your fuel pump is working. I usually check for spark first, because it's an easier test. Sounds like the engine is not starting. If it runs at all, you must have spark. If no spark, fix that first.

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If the engine starts and run good on second or third time. Install fuel pressure gauge and run the engine for a wile and turn OFF. the fuel on running engine will be 60-65 PSI. After 5 min. will drop to 40 PSI.If continue to drop to 0 PSI suspect fuel pressure regulator or fuel pump.

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If my tahoe fuel pressure is 40 psi and slowly dropes does that mean pump bad or leaking fuel lines


Well, do you smell fuel once the system is charged and not running? Do you see any fuel on ground or along fuel line? There are only a few connections where it could possibly leak. Most likely though is you are correct in assuming that the pump is bad. It should hold pressure. Are you having problems starting the vehicle, or does it take longer to start than it used to? If so it's the pump.

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Injector require 40 PSI on a Ford. Your Fuel Pump is BAD

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I would change the fuel pressure regulator first, if no change in pressure the fuel pump is on the way out.I have a 01 silverado 4.8 and my fuel pressure is between 55and60 psi.

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Fuel pressure intermittently drops causing sputter and die.


check for 12v constant at your fuel pump if you are not getting that replace your relay.
if you are getting 12 volts at your fuel pump the fuel pump is possible to run tuel it gets warm then shut down to a lower rpm I would then replace the fuel pump

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2 Answers

FUEL PUMP MAKES NOISE PRESSURE GAGE READS 40 PSI ENGINE BEGINS TO SPUTTER MY PRESSURE GAGE DROPS TO ABOUT 20 PSI


Fuel pump is bad. At idle pressure should read 50 PSI. Replace with original manufacture fuel pump after market pumps will burn out fast and are unreliable from my experience. Also could have a bad fuel regulator but that only works while driving down the road full throttle. You can unhook the fuel rail pressure regulator and that will give it full fuel and the pressure reading should read 60 PSI while it is running. If you turn the engine off and turn the key to run position it should read 50 PSI and hold for 60 seconds, if it drops below 30 PSI after 30 seconds Pump is defective. Many pumps are going bad here of late as people have been running them less than ¼ tank and this kills the pump. The fuel cools and lubricates the pump so the lower the fuel level the worse it is on the pump below ¼ tank. Not to hard of a job to do if you want instructions let me know.

Sep 28, 2009 | 1997 Chevrolet Lumina

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Vacuum line for fuel pressure regulator 98 Tahoe


Was there a hose on the old one? If not, you don't have one. It is most likely your fuel pump if you are not getting fuel.

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1997 tahoe wont start


it is not the regulator if it has 40 lbs of pressure try to pinch off the return line and if pressure drops quickly it is either the check valve in the pump or the rubber seal between the pump and the sending unit

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