Question about 1990 Ford F350

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Fuel System will not hold pressure

I have an 85' F-350 with the 6.9. i have resealed all injectors ran new fuel lines and it will not hold any fuel pressure!! Help please!!

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Check the lines to make sure the o rings are installed. there must be a leak in a line (crack) or in the fittings (cross threaded or no seals)

Posted on Sep 01, 2008


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1999Buick regal gs. Car shut off like it wasnt getting fuel changed filter got me home ran fine then cranks stuts back off like no fuel again blak flood smoke coming out exhaust

Use a fuel pressure gage, check for proper fuel pressure, key on engine off. Then with key off, see if pressure will hold for a bit? If the pressure drops like a rock, check for a fuel pressure leak, check for fuel injector leak and fuel pressure regulator leak. If fuel pressure regulator is connected to fuel rail and has a vacuum line, check to see if gas in the vacuum line, if so, pressure regulator is faulty.

Check for applicable trouble codes? How long since a tune-up?

Oct 28, 2015 | Cars & Trucks

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1997 Ford F-150 4.2 V6 boggs down going up hill and stepping on gas.

Check or replace fuel filter again. You could have had a lot of sediment in your tank. If it ran good for a week, that's where you need to start figuring out what was replaced during that time. If you can, check fuel pressure at schraeder valve on fuel rail.

Oct 16, 2015 | Ford Cars & Trucks

1 Answer

Pulled off fuel line to the injector rail and it started till it ran out of gas.changed fuel pump,regulator and injectors,good spark to plug,but if I pull off line again it will run help please

Year make and model please. Plus what line/s did you pull? If pulling the fuel pressure or return lines and it ran. You may have bought a bad fuel regulator.

May 12, 2015 | Cars & Trucks

1 Answer

How do I fine a leak on Pontiac sunfire? Won't start just gas vapors like steam?

Well, you need a quick tutorial on your fuel system. Now to find a leak, stop trying to start the engine. You are only adding electrical charge to an already dangerous situation. Now stop and think this through. Modern fuel injection requires fuel under high pressure to operate. The injectors are immersed in this pressurized gas, as are the lines leading to them from the fuel tank's fuel supply line. So just by turning the key to ON, not start, you have initiated the process to start the engine, and that means the pump has operated for 2 seconds to put the fuel system under high pressure.

Now if you follow the fuel supply line (from the gas tank) to the engine connection, start here to find a leak. It is now under high pressure from here to the injectors on the engine- one for each cylinder-it should be dripping with gas somewhere. You could even turn the key to off after the pump has ran for 2 seconds. The fuel system is designed to hold pressure in the system for about 10 to 15 minutes, before slowly bleeding off. Enough time to search for a gas leak. A couple of other things associated with the system: there will be also a fuel return line from the injector rail, it goes back into the gas tank. both the supply line and the return line often run alongside each other. There is also a fuel pressure regulator, immersed in the fuel rail, a seal on that may have started leaking. If an air breather housing, or some cover prevents your seeing the fuel system entirely, then set it aside. You should be able to find the leak. Just be careful, have lots of rags handy, happy hands are learning hands.

Dec 28, 2014 | 2000 Pontiac Sunfire

1 Answer

2002 Montana ran out of gas put new fuel pump in new filter new fuel pressure regulator getting gas have pressure if I fill cab with gas it runs but will not start other wise

Did you remove all air from the tubing from the gas tank to the fuel pump? Read more on the net about air bubbles in the fuel line.

Sep 11, 2014 | 2002 Pontiac Montana

1 Answer

Replace fuel inj 2009 lincoln ls 3.9 eng

Check this procedure about V8 3.9L Fuel Injectors - Removal & Installation
  1. Before servicing the vehicle, please familiarize yourself with safety procedures.
  2. Relieve fuel system pressure.
  3. Remove or disconnect the following:
    Negative battery cable Engine appearance covers Fuel lines Fuel pressure regulator Fuel cross over elbow Fuel injector connectors Fuel injector clamping plates Fuel injectors
To install:
  1. Install or connect the following:
    Fuel injectors. Use new O-ring seals. Fuel injector clamping plates Fuel injector connectors Fuel cross over elbow Fuel pressure regulator Fuel lines Engine appearance covers Negative battery cable
  2. Start the engine and check for leaks.

  1. Before servicing the vehicle, please familiarize yourself with safety procedures.
  2. Disconnect the negative battery cable.
    CAUTION The engine appearance cover is equipped with a noise suppressor. If the noise suppressor becomes separated from the engine appearance cover it must be positioned on the intake manifold prior to installing the engine appearance cover.
  3. Remove the engine appearance cover and the noise suppressor, if detached.
  4. Remove the air cleaner outlet pipe.
  5. Release the fuel system pressure.
  6. Remove the four engine appearance cover mounting bracket nuts and the brackets.
  7. Disconnect the fuel pressure sensor electrical connector from the sensor.
  8. Disconnect the fuel pressure sensor vacuum connector from the sensor.
  9. Disconnect the eight fuel injector electrical connectors from the injectors.
  10. Disconnect the fuel temperature sensor electrical connector from the sensor.
  11. Disconnect the fuel supply tube retaining clip from the fuel injection supply manifold.
  12. Disconnect the fuel supply tube spring lock coupling.
  13. Remove the four bolts and the fuel injection supply manifold and fuel injectors as an assembly.
  14. Remove the fuel injectors from the fuel injection supply manifold.
    CAUTION Use O-ring seals that are made of special fuel-resistant material. Use of ordinary O-ring seals can cause the fuel system to leak. Do not reuse the O-ring seals.
  15. Remove and discard the 16 O-ring seals from the fuel injectors.


    Fig. Exploded view of the fuel injector mounting-3.9L engine shown

To install:
  1. Lubricate the new fuel injector O-ring seals with clean engine oil before installing.
    CAUTION Use O-ring seals that are made of special fuel-resistant material. Use of ordinary O-rings can cause the fuel system to leak. Do not reuse the O-ring seals.
  2. Install sixteen new O-ring seals onto the fuel injectors. Lubricate the O-ring seals with clean engine oil prior to installation.
  3. Install the fuel injectors and clips onto the fuel rail.
  4. Install the fuel rail and injectors as an assembly. Tighten the fuel rail bolts to 89 inch lbs. (10 Nm).
  5. Install the remaining components in the reverse order of removal.

Keep us updated.

Jan 14, 2011 | 2002 Lincoln LS

1 Answer

1995 k 1500 6.5 turbo will not start, new pmd mounted on fire wall. replaced fuel soleniod yesterday truck started ran fine this morning it would not start??have fuel on the bleed off line coming out after...

may have a leak in the fuel line letting air in/ diesel engines need to be air tight/ look over all possible lines and injectors may be loose had same problem/ another poosibility may be low pressure fuel pump under driver side of chasis not holding pressure and letting fuel back in to tank

Oct 20, 2010 | 1995 Chevrolet K2500

1 Answer

How do you install injectors in a chevy s-10 pick-up?

Removal & Installation

Exploded view of the fuel rail and injector mounting

Take care when servicing the fuel rail assembly to prevent dirt or contaminants from entering the fuel system. ALL openings in the fuel lines and passages should be capped or plugged while disconnected.
  1. Before disassembly, clean the fuel rail assembly with a spray type cleaner such as AC Delco® X-30A, or equivalent. After removal, DO NOT immerse the fuel rail in liquid solvent.
  2. Properly relieve the fuel system pressure and disconnect the negative battery cable.
  3. Remove the air intake duct, as necessary for access.
  4. Tag and disengage the fuel injector electrical connectors.
  5. Disengage the fuel pressure regulator vacuum line, then tag and disengage all other necessary vacuum hoses.
  6. Loosen and remove the fuel rail retaining bolts.
  7. If necessary to remove the fuel rail assembly completely from the engine compartment, or to prevent stressing and damaging the fuel lines, disconnect the fuel lines from the rail assembly.
  8. Carefully lift the fuel rail assembly and fuel injectors from the intake.
  9. Carefully release and separate the fuel injectors from the rail assembly.
  10. Remove and discard ALL old O-rings from the fuel injectors and, if disconnected, the fuel lines.
To install:
  1. Lightly coat the new O-rings with clean engine oil, then position them to the injectors and, if applicable, fuel fittings.
  2. Install the injectors to the fuel rail assembly.
  3. Carefully install the fuel rail and injectors to the intake manifold. Make sure the injectors are properly seated in their bores, but DO NOT force them into position.
  4. Install and tighten the rail retaining bolts to 62 inch lbs. (7 Nm).
  5. If removed, connect the fuel lines to the rail assembly and secure the fittings.
  6. Engage the fuel pressure regulator and any other vacuum lines, as noted during removal.
  7. Engage the injector electrical connectors.
  8. Connect the negative battery cable and cycle the ignition switch (without attempting to start the engine) in order to pressurize the fuel system, then check for leaks.
  9. Install the air intake duct.

Apr 25, 2010 | 1992 Chevrolet S-10

2 Answers

Strong gas odor

  1. The fuel lines may have a leak: Replace leaking fuel lines and/or fuel line fittings.
  2. The engine may have mechanical problems: Check vacuum lines and fittings for leaks. Check engine compression. Check for broken fittings and mounts.
  3. The fuel pressure regulator may be operating at too high a pressure: Perform fuel pressure test and repair or replace faulty component(s).
  4. The ignition timing may be set wrong: Check and adjust ignition timing.
  5. The fuel injectors may leak: Clean or replace fuel injectors.

Sep 15, 2009 | 1996 Ford Explorer

1 Answer

2000 accord no fuel pressure

there is no pump in the tank to pressurise the fuel. it is all pulled by vaccum. i would guess it is sucking air somewhere or you didn't clean the high pressure lines correctly and it is leaking fuel into the crankcase. also you shouldn't reseal the injector sleeves, they should be replaced and lock tight put on the tips when reinstalled

Jun 24, 2008 | 2000 Honda Accord

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