Question about 1993 Jeep Grand Cherokee

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Cant hold pressure in fuel rail 1993 jeep gand charokee seems to want to start but shuts right down fuel is coming out of line at good rate i replaced fuel pump and fuel pressure regulator no change yet whats next

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I'm assuming you disconnected the fuel line and placed the line in a container to catch the fuel when observing the flow.

it might sound strange but i think there might be a leak in the tank coming from the fuel pump assembly. it's possible a tube or hose is broken on the assembly and the pump is just pumping the gas back into the tank.

there's flow because there is no pressure building up with the line disconnectedand the gas flows. when connected, pressure builds and blows out the break in the tube or hose.

Posted on May 02, 2010

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Posted on Jan 02, 2017

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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

2 Answers

My 1993 jeep fuel line (sending) keeps rupturing,ive had it out 4 times and have replaced all the lines with hi-dollar hi- pressure lines,but it does it again


Sounds like the fuel pressure regulator is not functioning. That should be a vacuum operated diaphragm on the fuel rail on top of the engine. If there is no vacuum to the diaphragm, the pressure will continue to climb until the line blows off or apart.

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MY 1996 JEEP CHEROKEE STARTS AND RUNS GREAT WHEN IT'S COLD BUT WHEN I DRIVE IT SAY 60 MILES AND SHUT IT DOWN GO IN SIDE SOME WERE AND COME BACK OUT AND I TRY TO START IT. IT STARTS AND THEN STARTS...


well, not sure. sounds like a over-rich condition. Get your fuel pressure checked. get it diagnosed properly before you throw a bunch of parts at it. savesin long run. sorry i cant help more.

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I have a 93 nissan 240sx with the KA24DE engine. I have been getting vapor lock after running the car for a little while and parking it. When I get in the car it will turn over for about a second then...


It's possible that the fuel system is slowly leaking down somewhere. Nissan injectors are known for leaking at the intake where they connect to the rail. Also, if the check valve in the pump is bad, fuel could be running back to the tank. The engine needs 30 psi in the fuel rail before the engine will start so if the system leaks down somewhere while the car sits, it will take a little while for the pump to build pressure again. If you can connect a fuel pressure gauge to the fuel rail, you'll be able to watch the pressure after you shut the engine down. It should hold residual pressure for a long time, if it doesn't, you will need to find where it's leaking down to.

Apr 15, 2011 | 1993 Nissan 240SX

1 Answer

How do I test fuel pump on 1993 bmw 325i. Car shut down while driving, will crank but not start.


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2 Answers

Whear is the fuel filter in my 1993 oldsmobile nintey eight


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1 Answer

1993 Jeep Grand Cherokee will not start. When


Check your fuel pump ,fuel lines,.One of the most overlooked starting causes is fuel delivery. Find the fuel rail to the injectors. Assuming you don't have a fuel pressure gauge, remove the dust cap on the fitting on the fuel rail and press the center pin in the valve to see if there's a good amount of pressure for a very brief second. There will be no continuous pressure unless the engine is running or is being cranked over. Have somebody crank it for you for a second to see if high pressure is present.

If not, first look at the fuel cutoff switch usually located in the inside stowage compartment of the vehicle. See if the reset button clicks when you press it. Next check the fuel pump fuse and relay, and finally the pump itself could be bad.

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1 Answer

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Check the fuel injecters for leaking. close off the return line and see if u have a pressure drop in the rail. If you do u have a leaking injecter.

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1 Answer

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