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Is it possible to check fuel pressure without a fuel pressure gauge? if so how do i do it?

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  • Cars & Trucks Master
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To find out if the pump is working, disconnect the fuel line to the fuel rail (or carburetor) and turn on the pump (move the ignition key to on). If fuel comes out, the pump is working.
If you don't have a fuel pressure gauge and want to know what the pressure is, bring your car to someone who does have a fuel pressure gauge (unless you have a calibrated fingertip and can tell the pressure by holding your finger over the end of the fuel line).

Posted on Aug 13, 2017

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Posted on Jan 02, 2017

michigan man
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SOURCE: where do i check fuel pressure on my focus i can

there should be a place under the hood close to the fuel rails where the injectors are give these websites a try www.alldatadiy.com and www.autozone.com if all fails stop by your local library and get your hands on a Haynes auto repair manual for your car wish you the best of luck Mich igan Man.

Posted on Jan 12, 2010

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Hard to start flooding out


Many possible problems. If you are sure it is flooding, leaky fuel injector(s) or bad fuel pressure regulator are likely. Connect a pressure gauge to fuel line and check pressure with key on, engine off, and then while running. Other possibles are bad EGR, IAC, coolant temp sensor, O2 sensor, plugged CAT or muffler.

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How do i check fuel pressure without a gauge


You can't know the correct pressure. But you can get a good idea by removing the return hose from the fuel rail , fit a length of hose to the rail and into a container start the engine, and fuel will flow into the container if the regulator and pump are ok.

Sep 28, 2014 | Cars & Trucks

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Throttle box repair


Start with checking fuel pressure with a pressure gauge. Some stores rent or loan fuel pressure gauges. If fuel pressure is within specs for your engine, scan the computer for possible trouble codes.
Fuel pressure is critical (and high on multi port injection-about 50 psi) and dependent on a good pump, a clean filter, and a working fuel pressure regulator-if pressure is correct, you have eliminated at least that much as not being the problem.

Jun 16, 2014 | 2007 Kia Optima

1 Answer

Oil level gauge and sensor


Should be relatively easy to access the wiring harness if you have even a little bit of skill. i'm assuming if you plan on checking wires you are not stupid and are capable. the fuel pump sending unit could be bad which is only remedied by replacing the entire pump assembly. it very well could be the wire(s)from the pump itself leading up to the gauge. if you know the gauge is working then either one other those two things are a possibility. the pump doesnt have to be replaced if the sending unit is bad you just will not know what fuel level your at.
AS far as the oil pressure switch goes if it was wired that way already and it previously worked properly that way i would look at shorts being a possibility. otherwise your oil pump could be out .
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Feb 12, 2013 | 1988 Renault 21

1 Answer

Po190 lincoln 2003 ls


DTC P0190 - Fuel Rail Pressure Sensor Circuit Malfunction
Check fuel pressure with a mechanical gauge and check the reading of the Fuel Rail Pressure (FRP) sensor on the scan tool.

When cycling the ignition switch from the off to the run position without starting the engine, the fuel pressure measured on the fuel gauge should match the reading of the FRP sensor on the scan tool.

If the mechanical gauge reading is showing to more than 2 psi higher than the FRP sensor input, replace the FRP sensor.

If the values match, start the engine. With the engine idling, the mechanical gauge will indicate about 10 psi different than the FRP sensor but when the vacuum line at the sensor is disconnected, the values should again match each other.

If the pressure reading matches the FRP sensor reading and the pressure is showing a reading of 30-45 psi Key On, Engine Off (KOEO) and at idle, check for a possible fuel quality issue.

Also check the engine temperature input reading from the Engine Coolant Temperature (ECT) sensor to verify it shows a believable temperature reading.

Possible Causes:
FRP sensor connector is damaged (check pins for damage, and for moisture)
FRP sensor reference (5v) circuit is open or shorted to ground
FRP sensor has failed
Vacuum leak(s) present in the engine

I hope this helps; remember to rating this and just keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment.

Have a nice day and thanks for using FixYa.
Jose.

Oct 17, 2011 | 2003 Lincoln LS

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Wont idle or start without priming tbi


first check fuel pressure with a mechanical fuel gauge that attaches to fuel line schrader valve. around T.B.I. if no pressure with key on check fuel pump relay for correct operation, and also the oil pressure switch has the fuel circuit to it so possible oil pressure switch also. fuel pump has a check valve to keep fuel from going back to tank, so when u turn key on fuel pressure should go up within 1-2 seconds on gauge. if fuel pressure goes down quickly, possible bad fuel check valve, change fuel pump and fuel pump check valve (located right above fuel pump inside tank)

Jan 15, 2011 | 1992 Chevrolet K1500

1 Answer

I have a 1999 ford expedition i have been have trouble starting it for a month now changed the fuel filter reset the fuel pump switch checked the fuses all good. It turns and half the time it starts now...


GO TO AUTO PARTS STORE BUY A FUEL PRESSURE GAUGE THAT CAN CHECK FUEL PRESSURE UP TO 100 PSI. LOCATE YOUR FUEL PRESSURE TEST PORT.LOOK FOR SCHRADER VALVE ON FUEL LINE NEXT TO EGR VALVE.PLACE A RAG NEAR THE SCHRADER VALVE AS YOU INSTALL FUEL PRESSURE GAUGE TO CATCH GAS SPILL AS YOU SCREW IN FUEL PRESSURE GAUGE HOSE FUEL PRESSURE 30 - 45 PSI WITH ENGINE RUNNING. THE ENGINE MUST BE OFF HOOK UP THE FUEL PRESSURE GAUGE.IF YOU HAVE TROUBLE THE FUEL PRESSURE GAUGE WILL HAVE INSTRUCTION HOW TO HOOK UP FUEL PRESURE GAUGE.BE CAREFUL CHECKING FUEL PRESSURE IS DANGEROUS JOB.DONT ALLOW NO MASSIVE FUEL SPRAYING WHEN HOOKING UP FUEL PRESSURE GAUGE YOU WILL GET CAR FIRE.

Jan 04, 2011 | 1999 Ford Expedition

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

1 Answer

If my pickup starts then shuts off does that mean the fuel pump is bad


This would be 1 possibility, can you hear the fuel pump whine or making a noise when you first turn on the key?
It should whine for a couple of seconds to pressurize the fule system then shut off until you try to start the engine. The best way to check is to connect a fuel pressure gauge to the fuel rail connector (looks like a tire valve stem) and the gauge screws onto this fitting. When you turn the key on you should see the pressure gauge read the pressure going to the fuel rail, when you start the engine you should see the pressure maintain pressure to keep the engine running. If not then the could mean that the fuel pressure is weak and would need replacing. Hope this helps

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