Question about 2003 Ford F150 Regular Cab

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The engine cranks fine, but won't start. Fuel pressure gets up to about 40 lbs. when cranking. There is a spark, but it may be too weak. Any good ideas?

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Your fuel pressure should actually be around 180lbs to run the engine.open the breather up and spray a very small ammount of starting fluid into the breather while you're cranking it. if it does start,your problems the fuel pump,or a clogged fuel filter.if it does'nt start you can move on to crankshaft sensor.or a bad fuel pressure regulator. thank you for choosing fixya.com

Posted on Dec 30, 2010

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Cranks but won;t start, is it the fuel pump?


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2000 olds 3.5 Dohc. Changed fuel filter checked fuel pressure @40 lbs resting cranking 45 lbs When i try and start it in the morning indoors won't fire crank the key to acc then on then back to acc then...


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2002 saturn sl won't start, turn over but won't start


If the engine fires up for a second or two with starting fluid then the fuel pump is weak.I would check the fuel pressure and if its not within the specs then replace the pump and filter.

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1 Answer

Cranks but will not start but getting fuel to engine


Are you getting the right amount of pressure at the fuel rail? I believe it is 40 to 47 lbs. Anything below this your pump is bad.
Also did you check for spark? You can do this with a screw driver, pull a plug wire insert the screwdriver in the wire set it close to the engine, but not touching. crank the engine and watch for a spark. Be carefull not to touch the screwdriver as it is being cranked, because it will bite you.
Let me know And we can go from there.
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1 Answer

99 Tahoe engine cranks, wont start


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 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.


The other thing to that is common is the (ICM) under the distributor cap. There is a breather screen on the bottom of the distributor that get's clogged with dirt causing condensation promoting corrosion, this was gm TSB for replacing the cap and rotor to make sure it's clean.

Good luck and hope this helps. Merry Xmas.

Dec 24, 2009 | 1998 GMC Safari

1 Answer

I have a Silverado 1500, 4.3 with 132,000 miles. After start, it runs fine, no signs of malfuntion. However it takes extended cranking to start. The fuel pump & filter was replaced 10,000 miles ago....


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.

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.

Also you mentioned that you replaced the fuel pump, it's common for the $15.00 wire harness from the fuel pump to the frame will break and there is a bad connection till the wires heat up. You can try this trick, turn your ignition on for 30 seconds "engine not running" and then turn it off for for 5 seconds and then try to start. This will energize the fuel line if the fuel line check valve is bad which is a part of the fuel pump and will heat up the wire harness which will make a better connection and see if the engine starts easier. Regardless, inspect the wire harness for corrosion and the ground is good. Good luck and keep me posted.

Dec 15, 2009 | 2000 Chevrolet Silverado 1500

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