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How to measure fuel pump pressure - 1999 Plymouth Voyager

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On the front of the engine you should see the fuel rail. In the middle of the rail there is a black plastic cap. Under the cap if the fuel pressure test port. You will need a fuel pressure gauge that will thread onto that fitting. It is a standard fitting that many manufacturers use. I personally refer to it as the big fitting.

Once the gauge is threaded on crank the vehicle over several times. You should see somewhere around 35 psi.

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2003. Why is no gas getting to the fuel rail?


Could be a "fuel pump relay" or ford equivalent that converts ECU fuel output demand signal to power to the fuel pump. To test jump direct positive to fuel pump and see if you get pressure at the rail. If you get pressure, that may be part of the problem. If not enough pressure (but measure) you may have a fuel pressure regulator or ford equivalent issue.

Jun 08, 2015 | Ford Ranger Cars & Trucks

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Loosing fuel pressure every ten to twelve seconds


are you using a gauge? is this the 1.0L engine 3cylinders.
Trottle body injection (TBI) >
running or not?
the correct way to do this is measure at the fuel filter test port

ill quote the FSM
  1. Relieve fuel system pressure.
  2. Disconnect the fuel inlet line at the fuel filter and install a suitable pressure gauge on the line.
  3. Connect a jumper wire between the terminals of the fuel pump relay connector and check the system pressure on the gauge.
  4. Fuel pressure should be 25-33 lbs.
  5. As the pressure reaches 33 lbs., the relief valve in the pump should pulsate the pressure so it is always within specification.
  6. If the pressure is above specification, check for restrictions in the fuel lines. If no restrictions are found, replace the fuel pump. If the pressure is below specifications, check for battery voltage to the fuel pump and correct as required. If battery voltage is found, replace the fuel pump or fuel pump relay.
  7. Before removing the pressure gauge, relieve the fuel pressure again.
  8. Reconnect the fuel line. Start the engine and check for leaks.
end quote.

Jan 28, 2014 | 1993 Geo Metro

1 Answer

Fuel pump problems


What is the fuel pressure and delivery? You have to measure those. It can be a pain to measure but you have to have good fuel pressure AND volume.

Mar 16, 2013 | Cars & Trucks

1 Answer

Stalling 2002 mercury grand marquis


Most parts retailers can tell you what the pressure should be from the pump or what pressure the pump is rated to put out. If pressure is low from the fuel pump- replace it.

Jan 12, 2013 | 2002 Mercury Grand Marquis

1 Answer

Is there anyway the measure pressure before fuel pump


you may need to measure pressure from your fuel pump to make sure it is functioning properly

Jan 08, 2013 | 1995 Chevrolet Blazer

1 Answer

2005 Lincoln Town Car suffering from low fuel pressure, I have Changed Fuel Rail pressure sensor, Fuel Pump driver, the fuel pump in the tank and the fuel filter but it is still showing only 26 psi fuel...


The ford spec listed in the ford engine control manual is:

General Specifications Item Specification Fuel tank capacity 71.9L (19 gal) Fuel Pressure Hot restart 448-482 kPa (65-70 psi) Key ON Engine OFF (KOEO) 140-415 kPa (20-60 psi) Key ON Engine Running (KOER) 170-280 kPa (25-40 psi)

Are you measuring the fuel pressure with a mechanical gauge or are you using a scan tool . If with a mechanical gauge, does the gauge have an air purge? What symptoms does the vehicle present. If running rough you could have a fuel injector leaking. Are you measuring the fuel pressure with the key on engine off? If so, did you cycle the key a few times? Good luck

Apr 05, 2011 | 2005 Lincoln Town Car

1 Answer

I need to know what the fuel pump pressure is on 02 gmc 1500 4x4 4.8.


Measure with the Key On Engine Off with the fuel pump commanded ON.

Vin (V,T,U)
Fuel Pressure (gasoline) 55-62 psi Vin (Z)
Fuel Pressure (ethanol) 48-54 psi

Hope this helps

Mar 07, 2011 | GMC Sierra 1500 Cars & Trucks

1 Answer

2003 4.6 f150 wont start replaced fuel pump, filter engine cranks computer reads all systems fine


When you turn on the key to Run, do you hear anything? There is an Inertia cutoff switch which kills the power to the fuel pump. This switch is usually behind the front kick panels and has a reset button that you push. It is a safety switch and can sometimes trip if a doorslam or impact is felt by the sensor.

There can be a Fuel pump relay in the black powerboxes, but there is no Code, so it should be okay. If you have a gauge to measure fuel pump pressure, check to see if the fuel pump is working by measuring pressure at the fuel rail.

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1 Answer

My fuel pressure is not holding how do i know if it's my fuel pressure regulator or fuel pump


MEASURE FUEL PUMP PRESSURE AT FUEL FILTER CONNECTOR. ATTACH PRESSURE GUAGE TO FITTING COMING FROM TANK. MAKE SURE THER ARE NO LEAKS FIRST THEN HAVE SOMEONT TURN THE IGNITION ON CK. GUAGE PRESSURE TURN KEY OFF PRESSURE SHOULD REMAIN CONSTANT SINCE PUMP IS DEAD HEADED ( NO RELIEF/ REGULATOR) IF PRESSURE FALLS ,PUMP INNER CK VALVE IS LEAKING. IF PRESSURE DOES NOT FALL THEN SUSPECT REGULATOR

Aug 06, 2010 | 2001 Pontiac Firebird

1 Answer

How much psi is coming from the fuel pump


#1

38.0 - 44.0
Note

Y251
#2

30.0 - 37.0
Note

Y252
Y251: Pressure (PSI) is measured at cold start injector with pressure regulator vacuum disconnected.
Y252: Pressure (PSI) is measured at cold start injector with pressure regulator vacuum connected.

Jan 31, 2009 | 1993 Toyota Camry V6

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