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What is the fuel pump psi reading on the on the gauge set at

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Posted on Dec 12, 2016

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My fuel pump seems to be pumping gas but my van wont start 02 chevy venture cranks gets fire an gas but wont start


Just because it pumps gas doesn't mean it is at the exact pressure it should be? Most fuel pumps have a psi of 40 to 45 psi, your fuel pump could be pumping at 25 psi or less which is not enough to start your car even though you can see some fuel pumping out. A simple tool to check fuel pressure can be bought at any auto parts store, check the specs on the fuel pump for your 02 Chevy first to see at what pressure it works, then use the fuel pressure gauge to check it. Anything less than what the specs on your fuel pump are suppose to be and you have a bad fuel pump?

Let's say your fuel pump works at 43psi, you hook up the fuel pressure gauge and you find that it reads 25 to 30 psi, that means it's not enough fuel pressure to start your engine.

Jun 07, 2015 | 2002 Chevrolet Venture

1 Answer

3ltrhow do I check fuel pump


You'll need a fuel pressure gauge that screws on to the schrader valve on the fuel line. Securely fasten the gauge and then turn the key to the on position. you should get a reading in the 26-30 psi range. If not, bad fuel pump. If you do have pressure then your injectors are not getting signal.

Oct 13, 2014 | Cars & Trucks

2 Answers

Fuel pressure 1998 jeep grand cherokee 4.0 L V6


You should have a test port on the Fuel Supply rail, use a tool from a local auto parts "Tool Loaner program" where you can borrow tools for free,w/a deposit of course,then follow the steps provided;

MPI Fuel System Pressure Test

The MPI fuel system used in vehicles equipped with a 4.OL engine employs a vacuum balanced pressure regulator. Fuel pressure should be approximately 55-69 kPa (8-10 psi) lower with the vacuum line attached to the regulator than with the vacuum line disconnected. System fuel should be 214 kPa (31 psi) with the vacuum line connected to the regulator and 269 kPa (39 psi) with the vacuum line disconnected. CAUTION: Some fuel may be discharged when connecting fuel gauge to fuel rail.
  1. Connect a 0-414 kPa (0-60 psi) fuel pressure gauge to test port pressure fitting on fuel rail (Fig. 7).
  2. Remove vacuum line from pressure regulator.
  3. Start the vehicle.
  4. Note gauge reading. With vacuum line disconnected, fuel pressure should be approximately 269 kPa (39 psi).
  5. Connect vacuum line to pressure regulator. Note gauge reading. Fuel pressure should be approximately 214 kPa (31 psi).
  6. If fuel pressure is not approximately 55-69 kPa (8-10 psi) higher with vacuum line removed from regulator, inspect pressure regulator vacuum line for leaks, kinks or blockage. CAUTION: Fuel pressure will rise to as much as 655 kPa (95 psi) when the fuel return tine is pinched shut, shut engine down immediately after pinching oft fuel return line.
  7. If fuel pressure is low, momentarily pinch shut the hose section of the fuel return line. If fuel pressure remains low, inspect the fuel supply line, fuel filter, and fuel rail inlet for blockage. If fuel pressure rises replace fuel pressure regulator.
  8. If fuel pressure is above specifications, inspect the fuel return line for kinks and blockage.

Capacity Test

  1. Remove the cap from the pressure test port in the fuel rail.
  2. Connect a 0-414 kPa (0-60 psi) fuel pressure gauge to the pressure fitting on the fuel rail (Fig. 7).
  3. Start the vehicle. Pressure should be approxi- mately 214 kPa (31 psi) with the vacuum hose connected to the pressure regulator and 269 kPa (39 psi) with the vacuum hose removed from the pressure regulator.
  4. If the pressure is not to specification, check the following before replacing the fuel pressure regulator:
  • 4a - Inspect the fuel supply and return lines/hoses for kinks or restricting bends
  • 4b - Check the fuel pump flow rate. A good fuel pump will deliver at least 1 liter of fuel per minute with the fuel return line pinched off. If the fuel pump does not pump adequately, then inspect the fuel system for a plugged fuel filter or fuel pump inlet filter (sock). Fuel pump flow rate can be done by connecting one end of an old A/C gauge hose to the fuel test port on the fuel rail and inserting the other end of the hose into a container of at least 1 liter capacity. Run the fuel pump by installing a jumper wire into diagnostic connector terminals D1-5 and D1-6. Be sure to pinch off the fuel return line or most of the fuel will be returned to the fuel tank.

May 19, 2014 | 1996 Jeep Grand Cherokee

1 Answer

2002 chevy malibu no fuel i hear pump run


To check your fuel pump,Connect a fuel pressure gauge to the fuel pressure test port connection. Turn key to on and reading should be 30 to 45 PSI.The valve to connect gauge is on fuel rail at fuel injectors.It has a cap on it,you have to remove.

Sep 08, 2012 | Cars & Trucks

1 Answer

I have a 1999 GMC Yukon getting fuel, spark and even cranking good at times. Then if I turn it off for a while, I have to squirt a shot of starting fluid into the intake hole and it cranks over & over...


If you have to spray fluid into it then it sounds like the fuel presseure is not there, get a fuel pressure gauge and see what the pressure reading is, then leave it hooked up for what ever time it takes to not start, before you try to start it check the pressure, if it has dropped then your fuel injector/s or fuel regulator is leaking, crank the engine after taking the reading, the fuel pressure should come back, 60-66 PSI, Vent the fuel tank vapors by loosening the fuel cap.Position the ignition switch and the A/C system in the off position. Install a fuel pressure gauge to the vehicles fuel pressure valve. and with the keyon, engine off verify the PSI reading on the gauge.
Anything less than 60 psi and your fuel pump is weak

Jul 28, 2011 | 1999 GMC Yukon

2 Answers

1998 2500 chevy wont start unless i pour fuel in throtle body when engine is cold


Check your fuel pump pressure, it is probably down in the 50 lb range and it requires a bit above that to start. Once it starts it will run on that pressure. This is a chronic problem with these, my 1998 2500 was a GMC but it's the same vehicle. I put 385,000 miles on it with no engine or transmission trouble but I was on fuel pump number six when I sold it.

Jul 10, 2011 | Chevrolet 2500 Cars & Trucks

1 Answer

My 98 Olds Bravada will only start if I spray ether into the carb. Any suggestions?


Hello alfred12954,

Your description sound like the fuel pump is not working. If you have a fuel pressure gauge it should read 60 - 66 psi with the key on. If it reads lower than 60 but more than 0 psi it won't start replace the pump.

If it reads 0 psi you are possibly looking at a wiring problem.

Regards,
netvan

Mar 09, 2011 | Oldsmobile Bravada Cars & Trucks

1 Answer

I put a new fuel pump in my 97 concorde, it ran just fine all the way home, but in the morning i wouldnt start. i put another pump in and the same thing happend. could this be a short somewhere?


Well, the fuel pump relay may not be getting electricity to the fuel pump.

Also, use the following procedure to test the fuel pump before changing it again:

TESTING Fig. 1: Connect the fuel pressure gauge C4799B or equivalent to the fuel rail service valve - 3.3L shown 88175g09.gif
Fig. 2: Checking the fuel pressure with a gauge - 3.5L shown 88175g10.gif
Fig. 3: Checking the pressure between the pump and the filter 88175g11.gif
Fig. 4: Place the other end of the adapter 6668 into an approved gasoline container 88175g12.gif
  1. Release the fuel system pressure as described in earlier in this section.
  2. Remove the protective cover from the service valve on the fuel rail.
  3. Connect fuel pressure gauge C-4799B or equivalent to the fuel rail service valve.
  4. Place the ignition key in the ON position. Using the DRB III tester or equivalent, access the ASD fuel system test. (The ASD fuel system test will activate the fuel pump and pressurize the system.)
  5. If the gauge reading equals the specifications, then further testing is not required. Without vacuum applied to the regulator, the 3.3L engine fuel system operates at 55 psi (379 kPa). With the engine idling and the manifold vacuum applied to the regulator, the system operates at approximately 46 psi (317 kPa). Without vacuum applied to the regulator, the 3.5L engine fuel system operates at 48 psi (331 kPa). With the engine idling and the manifold vacuum applied to the regulator, the system operates at approximately 39 psi (269 kPa). The fuel system pressure varies with the different amounts of manifold vacuum applied to the regulator. If the pressure is not correct, record the pressure and remove the gauge.
  6. Ensure that the fuel does not leak from the fuel rail service valve. Install the protective cover onto the fuel rail service valve.
  7. If the fuel pressure reading was below the specifications, test the system according to the following procedure:
    1. Perform the fuel pressure release procedure.
    2. Install a fuel gauge C4799 and fuel adapter 6631 or equivalent in the fuel supply line between the tank and the fuel filter.
    3. Using the DRB III scan tool or equivalent, with the ignition key in the ON position, repeat the ASD fuel system test.
  8. If the pressure is at least 5 psi (1 kPa) or higher than the reading recorded, replace the fuel filter.
  9. If no change is observed, gently squeeze the return hose. If the pressure increases, replace the pressure regulator. If the gauge reading does not change when the return hose is squeezed, the problem is either a plugged inlet strainer or defective fuel pump.
  10. If the fuel pressure reading was above the specifications test the system according to the following procedure:
    1. Perform the pressure release procedure.
    2. Install fuel pressure gauge C4799 and adapter 6631 or equivalent in the fuel supply line between the fuel tank and the fuel filter.
    3. Remove the fuel return line hose from the pump at the tank. Connect pressure test adapter 6668 or equivalent to the return line. Place the other end of adapter 6668 into an approved gasoline container. A minimum of 2 gallon tank should be sufficient. All return fuel will flow into the container.
    4. Using the DRB III scan tool or its equivalent, with the ignition key in the ON position, repeat the ASD fuel system test.
  11. If the pressure is now correct, replace the fuel pump.
  12. If the pressure is still above specifications, remove the fuel return hose from the chassis fuel tubes (at the engine) and attach fuel pressure test adapter 6668 or equivalent to the return tube. Place the other end of the hose in the clean container, repeat the test. If the pressure is now correct, check for a restricted fuel return line. If there is no change observed, replace the fuel pressure regulator.
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Oct 08, 2010 | 1997 Chrysler Concorde

2 Answers

How do i check the fuel pump on my 92 mitsubishi mirage to see if its putting out enough pressure


You connect a fuel pressure gauge to it. The gauge set has many adaptors that can be used for almost any cars. It is expensive tho. That is the only way to know how much pressure it is putting out. Althou you dont really need a pressure gauge to find out if it is not putting enough pressure. Symptom of weak fuel pump,is hessitation on acceleration, Altho a malfuntioning ignition system also causes hessitation problem. If you posted exactly what the car is doing, I maybe able to help you without you having to buy a pressure gauge which is very expensive.

Jun 27, 2009 | 1992 Mitsubishi Mirage

1 Answer

FUEL PRESURE / FUEL GAUGE


Buick with a 5.0?? OK, regardless, pressure should not drop like that. Possible that fuel filter is full of **** & should be changed, or, you may indeed have a bad pump... (can happen). Sending unit: sounds like you have the leads reversed or the unit is somehow different than the one you replaced.

Nov 11, 2008 | 1995 Buick Riviera

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