Question about 1985 Ford F 250

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No fuel pressure 85 F250 6.9 diesel what to check

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I would start by checking the fuel filter, then go to the lift pump.

Posted on Mar 08, 2011

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SYSTEM WONT BLEED


diesel engines high pressure pumps not suppose run dry.diesel fuel keep high pressure pump cool and lubricated.problem could be fuel pressure regulator in the fuel filter water separator housing.replace fuel filter see if it helps problem could be fuel pressure regulator in fuel filter housing, the fuel pressure regulator has a air bleed orifice that allows vent to the fuel tank.make sure fuel pump fuse okay pump getting power. i would let garage or dealership check it out if all fails because your diesel engine fuel timing is pcm controlled if let fuel system go dry you probably have to have fuel injection timing reset or could have damage high pressure pump letting it run dry i hope thats not the case because high pressure pump not cheap part i hope it not that.

Sep 17, 2012 | 2008 Ford F-350 Super Duty

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2000 Isuzu Diesel 4wd wont start


make sure the battery is good, to make good start. if it is still don't go, need to check fuel filter then prime the system. 85% of the diesel engine the problem is the fuel system.

Feb 28, 2011 | Isuzu Rodeo Cars & Trucks

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2006 ford f350 deisel turns over wont start unless i use starting fluid it then runs great. changed fuel filter oil filter and oil, wrench symbol came on went into engine fail safe mode, said something...


the diesel engine is a 6.0L or a 6.4L? because the 6.0L don't use electronic throttle control. they control the demand of diesel threw the high pressure oil system they have a sensor call injector pressure regulator. this sensor is responsible of maintain the proper pressure in the high pressure oil system so that the engine could start . i also suggest you to check if it is any leak on the high pressure oil system or if the low pressure system is delivering the pressure required for the high pressure system to work properly. to do that you most have a scan tool. also you can check the pressure of the diesel pump that its in the chassis to eliminate the high pressure oil system as the cause of your concern. if u don't have the proper gauges to check the pressure of the diesel pump you could remove the cap of the small fuel filter that is next to the oil filter remove the filter and put the ignition switch in the on position and see in the container if you have a fast or slow filling. if you encounter that the filling is too slow then your problem is with the fuel diesel pump that is on the chassis this pump is called HFCM, Horizontal Fuel Control Module

Jan 30, 2011 | 2006 Ford F 350 Super Duty

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Will not start only backfires and start dieseling.5.7 automatic. hear fuel pump running. ran fine last trip and parked overnight. few times in past week or two. little trouble starting. rough idle for few...


You need 3 things.
Compression
Good hot blue spark to all plugs.
Good gasoline and proper fuel pressure. 63-64 lbs.
If you have all 3 then move on to injector pulse to all injectors.
I think each injector is on a separate driver on that one.
Check for pulse to all of them.

You may be weak on fuel pressure . Even a couple of lbs low on a cold start will cause a no start. Double check cold start cranking fuel pressure. If under 63-62 lbs you have problems.one test is to give it a squirt of carb cleaner not starting fluid. If you get a intake or engine full of starting fluid it can blow things. Carb cleaner will start it if it is a fuel problem and lot safer. Also in the good old days when i was a kid, i used to get a couple of cans of starting fluid and get in the back and have a good starting fluid spraying contest. Good for a big blast if someone lights a match. If it starts then you have a fuel pressure problem. Run the full fuel pressure test and post back pressures.

Here is the guide lines on testing.
Hard to start cold.
Check cold start fuel pressure.
Check engine running fuel pressure.
Check engine running on the road fuel pressure.
Then shut it off and watch for fast leak down.
Pinch off at rubber part or block off return line and check full pressure.
V8 gm engines should have 60-66 fuel pressure.
Cold start should be 64-65 lbs of pressure.
If you do not have full fuel pressure on a cold start the injectors will not squirt fuel. Do not leave home without it.
Engine running should be 60-66 lbs pressure depending on engine load.
Full pressure with return pinched off should be 75-85 or more.
And if it has a fast leak down after shut off you have a leak.


The 75-85 is only a check on the capable full pressure of fuel pump.
If you can not find the rubber return line check full pressure by plugging return line or just or the true full pressure can be taken direct at the end fuel filter.
What are the pressure readings that you have done.
What are your cold start pressure readings?



Feb 01, 2010 | 1998 Chevrolet C1500

2 Answers

Runs ruff at idle and when excellerating is missing


yep change the pump! and new filter too!!!

Jan 13, 2010 | GMC Jimmy Cars & Trucks

1 Answer

Car wont start. Has spark, tried Carb Cleaner.


You may be weak on fuel pressure . even a couple of lbs low on a cold start will cause a no start.
Double check cold start cranking fuel pressure. If under 63-62 lbs you have problems.
one test is to give it a squirt of carb cleaner not starting fluid. If it starts then you have a fuel pressure problem.
Run the full fuel pressure test and post back pressures.
Here is the guide lines on testing.
Hard to start cold.
Check cold start fuel pressure.
Check engine running fuel pressure.
Check engine running on the road fuel pressure.
Then shut it off and watch for fast leak down.
Pinch off at rubber part or block off return line and check full pressure.
Later V6 and V8 gm engines should have 60-66 fuel pressure.
Cold start should be 64-65 lbs of pressure.
If you do not have full fuel pressure on a cold start the injectors will not squirt fuel.
Do not leave home without it.
Engine running should be 60-66 lbs pressure depending on engine load.
Full pressure with return pinched off should be 75-85 or more.
And if it has a fast leak down after shut off you have a leak.

The 75-85 is only a check on the capable full pressure of fuel pump.
If you can not find the rubber return line check full pressure by plugging return line or just or the true full pressure can be taken direct at the end fuel filter.
What are the pressure readings that you have done.
What are your cold start pressure readings?
Post back what you have. Good Luck

Dec 24, 2009 | 2002 Chevrolet Blazer

2 Answers

I went and put unleaded regular gas into my 2005 Volkswagen Jetta drove home and when I went to start car again, it will turn on for about 5-10 seconds and turns itself right back off!! PLEASE HELP!!


Are you sure you did not put diesel in by accident or E-85? The VW will run on regular gas(not recomended) but diesel or E-85 gas is Bad for it. The E-85 can clog up stuff. You will need to drain and flush the fuel system, a new pump might help and all filters as well. Sounds like you got E-85 or Diesel by mistake. If this is helpful, please leave feedback. Thanks, SP

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1 Answer

Diesel engine, grey market kubota, the turqouise


yes there is a low pressure pump and a high pressure(incjector pump) if your no getting fuel to engine check for low pressure pump to be working may also have air in system which is very hard to get out and a diesel wont run untill most or all air is gone

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How to prime fuel line on 85 Ford Diesel Van


Sometimes you will have to put fuel into the intake to start the motor, then once started the motor will **** the fuel through the lines

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