Question about 2002 Cadillac Escalade

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I have a start problem and i have a fuel pressure gauge set on the inj rail pressure bieng only 20 psi and then drops to 0 after cranking sound like it initially wants to start then stalls i have about 120,000 on the vehicle

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I will be very honest here, I do not know your vehicle.
That said,just cycling the ignition key,you should have 40# fuel pressure or more.
I suspect you have a bad fuel pump or other issues, like a bad fuel pump driver module,if that applies

Posted on Oct 01, 2010

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Fuel pressure regulator may be controlled electrically thru fuel pump on this vehicle, I recommend replacing your fuel pump with new unit and check all fuel lines for posssible leaks

Posted on Oct 01, 2010

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Why does my ford explorer start and idle good but after it warms up it loses all power back fires and fuel pressure drops to 0 psi


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02 jeep liberty 3.7 will losing fuel pressure


ask to Drop out you mean. blow would shoot the ASD relay cloudwards. LOL but may be it is,, there is always a first.
loosing fuel pressure, what does that mean?
  1. i just think it.
  2. the fuel rail fitting cracked open a bit, is dry, cranking.
  3. fuel pressure gauge (a tool in any shop) reads 0 psi.
  4. ? surprise me.?

Sep 26, 2014 | 2002 Jeep Liberty

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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.

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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

Cranks normal wont start


bad spyder it sonds like

Apr 01, 2010 | 2000 Chevrolet Blazer

1 Answer

Hard start/long crank after warmup and sits for 20 30 minites. ( new inj, new plugs, clean throttle body. Don


get yourself a fuel pressure gauge from sears hardware and check the pressure. watch to see if the pressure drops down as the truck sits. if it's dropping down you may need to replace the fuel pressure regulator or the fuel pump. more likely the regulator

Nov 17, 2009 | 2001 Ford F150 Styleside SuperCrew

1 Answer

1998 wrangler efi system


FUEL PUMP WILL PUT PRESSURE IN FUEL RAIL FOR YOU. sounds like fuel pressure in the fuel rail is losing pressure usally caused from fuel pump starting to go out. check pressure with fuel gauge. screw it onto the fuel rail connection turn the key forward (do not start ) then turn key off presure should hold around 16 psi. if the gauge starts to drift back down then the fuel pump is going to go out ( sometime)

Sep 03, 2008 | 1998 Jeep Wrangler

1 Answer

4.0 litre engine, auto transmission, long cranking time before it starts. When it starts there is a smell of gsoline, rich.


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Aug 12, 2008 | 1996 Jeep Cherokee Sport

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