cutting out and more
Thread Starter
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Laughing Gas
Joined: Nov 2002
Posts: 1,144
Likes: 20
cutting out and more
'86 F-150 EFI 302
Here's the background:
Last year August I had the engine overhauled. The high pressure fuel pump ran quiet before the overhaul. After the overhual the pump ran LOUD. I installed a new fuel pressure regulator. No change. Had new high pressure pump installed. New pump was just as loud as the old one. I tolerated the noise for a year. Three days ago I picked up a new pump and had it installed. Just as loud as the ones before. Today I had a fourth high pressure fuel pump installed and it's just as loud. I even tried different brands of pumps.
New fuel filters were installed with each pump.
The truck ran great, even with the first and second loud pumps. Since the change of pump three days ago the truck is cutting out above 2000 rpms while driving. Still does it with the fourth pump and filter.
I can't figure this out. Why can't I get a high pressure pump to run quiet as it was before the overhaul and why is it cutting out on me now? The mechanics aren't being much help.
I'm broke, mad, and the weather is turning horribly cold for who knows how long. I'm at my wits end with this. Any help is appreciated.
Here's the background:
Last year August I had the engine overhauled. The high pressure fuel pump ran quiet before the overhaul. After the overhual the pump ran LOUD. I installed a new fuel pressure regulator. No change. Had new high pressure pump installed. New pump was just as loud as the old one. I tolerated the noise for a year. Three days ago I picked up a new pump and had it installed. Just as loud as the ones before. Today I had a fourth high pressure fuel pump installed and it's just as loud. I even tried different brands of pumps.
New fuel filters were installed with each pump.
The truck ran great, even with the first and second loud pumps. Since the change of pump three days ago the truck is cutting out above 2000 rpms while driving. Still does it with the fourth pump and filter.
I can't figure this out. Why can't I get a high pressure pump to run quiet as it was before the overhaul and why is it cutting out on me now? The mechanics aren't being much help.
I'm broke, mad, and the weather is turning horribly cold for who knows how long. I'm at my wits end with this. Any help is appreciated.
Thread Starter
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Laughing Gas
Joined: Nov 2002
Posts: 1,144
Likes: 20
Originally posted by 83_f150_me
you may have the pump too far towards the back of your truck........those thing pull fuel better than they push it......good luck
you may have the pump too far towards the back of your truck........those thing pull fuel better than they push it......good luck
I'm getting fed up with the mechanic, he doesn't seem to care too much if the problem gets fixed or not. Looks like I'm on my own again.
Thread Starter
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Laughing Gas
Joined: Nov 2002
Posts: 1,144
Likes: 20
Where should I start when trouble shooting this problem? Hopefully the weather will be getting nice enough to start looking over the truck. I'll check fuel lines. What else? Spark plugs? Anyone have any ideas why it would be cutting out over 2000 rpms?
Posting Guru
Joined: Jul 2002
Posts: 1,147
Likes: 1
From: East Coast
maybe the pump in the tank isn't working? This is forcing the high pressure pump to pick up the slack, and pull fuel from the tank. The extra strain on the pump might be what is making them all loud, because their all working extra hard. And then maybe the pump may not be able to provide adequate pressure when the motor requires it.
Just a thought. Good luck
Just a thought. Good luck
New User
Joined: Jan 2004
Posts: 5
Likes: 0
This might not be happening to you. I own an '85 F150 302EFI and it started giving me trouble running. Had no power at first, fouled out plugs, wouldn't idle without giving the engine 3/4 throttle. I took it to an IDIOT of a mechanic and suggested him checking the timing chain. He asured me that the problem had to be something else. We tried everything from pressure regulator, computers, fuel pumps (internal/external) nothing helped. After that IDIOT left the garage a buddy of mine started messing with it and the timing chain upper gear, which is plastic from Ford, was worn out. Replaced gears and timing chain and the trucks runs like a brand new one. I don't know if this is your problem but would not hurt to check.
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Senior User
Joined: Aug 2003
Posts: 175
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From: Gonzales
i have the same prob have you pulled the codes from the computer, if not do that...the intank pump idea sounds good, check that pump out...also the throttle position sensor (under throttle body) may be bad take a good look at that...good luck if i find anything else wrong with mine i'll let you know
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New User
Joined: Jan 2004
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Map Sensor could be causing your truck to run like crap. And it sounds as if the fuel line return back to the tank(s) are plugged/or pinched off. Check the fuel pressure, if it is too high, you have found your problem for the loud fuel pump.
Moderator
Joined: Jan 2001
Posts: 57,027
Likes: 2,763
From: Virginia
Originally posted by nickmobile67
maybe the pump in the tank isn't working? This is forcing the high pressure pump to pick up the slack, and pull fuel from the tank. The extra strain on the pump might be what is making them all loud, because their all working extra hard. And then maybe the pump may not be able to provide adequate pressure when the motor requires it.
Just a thought. Good luck
maybe the pump in the tank isn't working? This is forcing the high pressure pump to pick up the slack, and pull fuel from the tank. The extra strain on the pump might be what is making them all loud, because their all working extra hard. And then maybe the pump may not be able to provide adequate pressure when the motor requires it.
Just a thought. Good luck
Thread Starter
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Laughing Gas
Joined: Nov 2002
Posts: 1,144
Likes: 20
How do I check the in-tank pumps to see if they are running properly? I've got dual tanks. High pressure pump is loud on both.
I hope to get to it tomorrow after work. Should be warm enough to get a start on it.
I hope to get to it tomorrow after work. Should be warm enough to get a start on it.
Moderator
Joined: Jan 2001
Posts: 57,027
Likes: 2,763
From: Virginia
Sure does sound like it doesn't have enough fuel. It would be nice to see what the fuel pressure is. I have heard though, that some of these trucks don't have a test port on the fuel rail for the guage hook-up.
Thread Starter
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Laughing Gas
Joined: Nov 2002
Posts: 1,144
Likes: 20
It does have a port on it. I'm taking down to a shop tomorrow and having a pressure test done and to see what else they can dig up on it.
What should the pressure be if all is operating as it should?
What should the pressure be if all is operating as it should?
New User
Joined: Jan 2004
Posts: 11
Likes: 0
From: ford country
if it was me id throw away the fuel injection and all the computer crap and go back to a 4bbl edelbrock and do away with all the electronic junk, too many sensors and little things to go wrong and when they do not even the mechanics can figure it out. so i just stick with the older trucks, mechalical every thing no electronics!! way easier 