Question about 1994 Jeep Grand Cherokee

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No start new fuel pump,fuel pressure regulator,plugs and wires,no fuel in fuel rail.and repaired all vacume hoses, when repaired all vacume hoses auto started then idle slowed dowm then shut off. hasen't started since all fuses are good

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  • Richard Scordino May 11, 2010

    If I understand this correctly, you have no pressure in the fuel rail now? Have you checked the pump relay? Is there voltage at the pump?

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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.

Posted on Jul 23, 2009

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01 4.0 ranger won't start but tries,replaced tips,mad,coil wires,plugs,cleaned injectors,fuel filter,and fuel pump.before I started it would start but only run on 2cylinders #2&5 checked plugs they had...


Replace the fuel pressure regulator, it isn't holding pressure
It's on the fuel rail on the passenger side, and are quite fond of failing on Ford engines. It is really simple to change, only two bolts, and not even that hard to access

Mar 30, 2015 | 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

2 Answers

How to check fuel pressure 91 geo storm gsi


1.6L DOHC (same way as the ISUZU impulse ) same car.
4XE1 engine twin cam.
has MPI injection with fuel rail, regulator and loop
disconnecting the feed line and stuffing it with guage only does 1 of 5 tests. done on MPI. it does JUST the shut test.
the correct way it to check it at the filter or rail tests ports on most cars.
in some cases you must add it.
they sell banjo fittings with test ports at summit racing dot com.
so the first question on all MPI cars, is , where is the stock fittings.
other cars the rail has a schrader valve or a plugged hole to add one. (test port) did you look first for this?
to test the FPR, unplug the vacuum line running
and pressure will jump up 6 to 10 psi.
this simulates wide open throttle pressure, a key fact in getting full power from engine, i test cranking presssure, idle, 3000rpm
and wot pressures to be sure the PFR is working, not just the pump.



the spec at the rail is.

Late 1986 to 1993 I-TEC MPFI system (after VIN 0908197)
Regulator vacuum line connected-36 psi
Regulator vacuum line disconnected-42.5 to 45 psi

the shunt test can hit 60 pis easy. do so for only 5sec.
as this stresses the pump .

the only rail drawing , shows no fittings (cheap buggers)



not even a cheap plug...

24024302-wtht4tipiqsxmsfaksxjx4vs-4-0.jpg below is the twin cam, 1.6L
buy a TEE feeting, and put it at upper, red arrow.
use clamps rated for fuel injection, not chezzy screw band clamps as seen on carb cars. use the correct parts.
or you will get leak and it will not be pretty,
the filter as at 14 ID. this is the pressure feed side of the loop.
30 to 60psi , so all parts must be rated over 60, psi, (100psi is a nice goal)

24024302-wtht4tipiqsxmsfaksxjx4vs-4-1.jpg

now the words directly from the IMPULSE FSM.

Testing
  1. Relieve the fuel pressure.
  2. Disconnect the fuel line near the engine and install fuel pressure gauge T-connector in the line.
  3. Connect the fuel pressure gauge to the T-connector.
  4. Start the engine and check the fuel pressure, it should be:
  5. 4XC1-Turbo and DOHC I-Mark, G200Z Impulse: 35.6 psi with the vacuum hose of the pressure regulator disconnected and plugged. 28.4 psi with the vacuum hose connected and at idle.
  6. 4ZC1-Turbo, 4ZD1 Impulse and 4ZE1 engine: 42.6 psi with the vacuum hose at the pressure regulator disconnected and plugged. 35.6 psi with the vacuum hose connected at idle. Disconnect the VSV before checking pressure.
  7. V6 engine: 9.13 psi at the fuel pressure line after the fuel filter.
  8. 4XE1 SOHC and DOHC engine: Flow test, disconnect the hose from the EFI fuel feed line at the engine and place in a suitable container. Apply battery voltage to the fuel pump. Pump should supply 1/4 quart (0.24L) within 15 seconds. Pressure test, connect a pressure gauge in the fuel pressure line after the fuel filter, located at the driver's side frame rail. Disconnect the vacuum hose from the pressure regulator. Apply battery voltage to the pump. After the pump stabilizes, the pressure should be 35-38 psi (245-256 kPa) and hold steady.

Apr 06, 2014 | Geo Storm Cars & Trucks

1 Answer

Engine flooding


Check the fuel pressure. The pressure regulator may have gone bad and is delivering too much pressure to the fuel rail, thereby flooding the engine.

Dec 07, 2013 | Cars & Trucks

1 Answer

1992 dodge Dakota put new fuel pump in and it ran great for like 3 days and now it will not start


Isitgetting gas to the fuel rail. check to see if you got pressure in the fuel rail. if there is no pressure, then replace the fuel pressure regulator. also chech the fuel pump relay. if it is not those then we going back to find the issue

Oct 28, 2012 | Dodge Dakota Cars & Trucks

1 Answer

The jimmy seems to spit and sputter when excelarate


This culprit can be a bad cam sensor, bad fuel filter, or weak fuel pump, or fuel pressure regulator valve. Or simply a clogged misfiring or just bad injector. By testing your fuel pressure first and seeing if after a while the fuel pressure has not dropped in the fuel rail test for say 30 mins. If the pressure stays up that test eliminates the fuel rail pressure regulator. If the pressure coming in is weak all together your filter or pump is bad. If the RPM gauge does not move when this happens it is the crank sensor. If when cold it runs fine and starts running worse after warming up check the cam sensor. There you go need any help ask for me.please rate my solution it is how i earn my achievements. Thanks in advance.

Apr 13, 2012 | 2000 GMC Jimmy

1 Answer

1999 Cavalier Z24 P0300. Changed plugs, plug boots, and coil packs. Burning rich...


Sounds like you have a bad fuel pressure regulator.Take the vacuum hose off the regulator and look for fuel if there is fuel present replace regulator.But if you don't have in vacuum hose hook a fuel gauge up to fuel rail then start the engine look at reading on gauge now pull vacuum hose off and if pressure does'nt rise 5-10 psi replace pump.

May 08, 2011 | 1999 Chevrolet Cavalier

1 Answer

Have a 2000 pontiac grand am 2.4 liter having trouble starting when cold or hot black smoke strong fuel smell and miss when startd but clears up and runs ok after that ?


sounds like a bad fuel pressure regulator,this located on the fuel rail that the injectors are on it has a vacum hose going to it,a small one,if you remove this vacum hose and there is fuel on the hose side this is bad even just a small amount,there should be no liquid on the vacum hose side,becarefull when replacing,you must relieve all fuel pressure 1st

Oct 01, 2010 | 2000 Pontiac Grand Am GT

2 Answers

1992 toyota celica gt 2.2 starts runs rough then dies


Sounds to me like the fuel pump is worn out. They DO wear out. And even though they seem to be working, the brushes in the electric fuel pump may not be contacting all the commutator, thus making the pump weak. It may start the motor but can't maintain normal running pressure (27-35psi). Have you run the car out of gas shortly before this problem surfaced? If you have then it's your fuel pump. It was damaged when the tank ran dry. Even though the pump may seem to be working, it's still badly damaged and needs to be replaced.
Just as Matmenzies has stated, get a fuel pressure gauge and test the pressure. I'd start with a complete check of all your vacuum lines. Check for cracks on the vacuum hose that connects to fuel pressure regulator on the fuel rail. Also, if you can, get a hand operated vacuum pump to check the regulator. If you can place a vacuum on the regulator and it holds, I'd say move on the fuel pump and check it.
BTW, if the fuel filter has been changed, you may want to check to see if it was installed backwards! Some fuel filters are valved and will cause symptoms like this. However, this is an immediately noticeable mistake and you haven't provided enough info for me to say more. I'd pull it and check that it has any flow at all. You could have sucked in a big dirt ball and blown it right into the new filter, effectively stopping fuel flow. Then I'd blow out the fuel lines, just to be sure.
Start with these 2 things and post what you find. We'll go from there.

May 16, 2009 | 1992 Toyota Celica

1 Answer

2004 lly duramax


try hooking up a fuel pressure test gauge to fuel rail pre filter and post filter and rev truck to 2500 rpm what is fuel pressure ?
next using a vacume pump attach to fuel pressure regulator pump up while engine is running only pump up to 8 psi to see if pressure changes if not replace pressure regulator .
it could also be ur speed sensor switch on overdrive transmission
good luck with it

Jun 29, 2008 | Chevrolet Silverado 3500HD Cars & Trucks

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