My friends 94 f-150 with a 5.0 will start, then it idles rough and dies. It also dies if you try and give it any throttle at all.
It was running good, he got home. a few days later he went to start it, and this is what is happening.
I found the code procedure, but I was going to go over tomorrow, and look at it.
I was thinking fuel filter, bay ideas on what else I might look at?
List of codes for a 94 is 3 digit right?

 

and where is this connector on a 94?

 

Ok I got a 116 ECT out of range, and a 636 TOT out of range.
What are these, and how would they affect this issue, and how do I fix it?
Also, Is there a separate pump in each tank

 

ECT is the engine coolant temp sensor, and if memory serves correct the TOT is the transmission oil temp sensor cant remember for sure though, and yes there are pumps in each tank both high pressure no pump on the frame rail, but do both fuel pumps work, If so do you get the same reaction on either tank or just one, have you done a fuel pressure test yet? This sounds like a low pressure symptom, and when was the last tune-up performed? Also check for vacuum leaks this can cause mis-readings to the computer. Sometimes a simple look over of hoses cures a lot, Let me know how it go's

 

is there a pressure port on the frame rail? if so where?
This is a tow tank truck, and both tanks have the same issue, so I am thinking that this is a clogged filter. If there is a place to hook up a pressure gauge, then I will just to be sure, but at the cost of a filter I should just change it while I am there, if he has one. I do not know about the last tune up, but he does take his truck in for service regularly. He is an older gentleman who can not afford a tow and repair bill right now. I am just trying to help him out.

thanks

 

On my 95 the port is drivers side front.

 

Those two codes are usually caused by not warming up the engine and transmission before running the KOEO tests.

 

I changed the fuel filter because he said that years ago this happened, and it was fixed by the filter. No change.
So what do I look for next?
No codes, fuel ok, air cleaner ok.
Needs a cap and rotor,
Truck starts and idles ok for a moment, then lopes. and dies. If you push on the throttle, then it dies, like the mix of fuel to air is way off? And it happened suddenly, not gradually.
Also, when I put the filter on, I got one of the lines on too far. how do I get that back to a normal position?

Thanks for any info.
Doug

 

Not sure how you can put a fuel line on too far. It either fits on the nipple or blows off under pressure.

You need to start with the basics here. You already commented the truck needs a new cap and rotor. I would suggest new plugs and wires as well. Have you pulled the vacuum line to the Fuel Pressure Regulator to look for signs of leaking? What is the fuel pressure at idle? Pressure with the vacuum line disconnected?

 

Ok,
Where is the fuel pressure regulator? and hose?
I will see if I can find a pressure gauge
The fitting on the tank side of the filter is all the way up on the pipe, against the can, and I can not get it to slide back so there is room for the clip. It has not blown off.

 

You may have the wrong filter. Ford changed the fuel line locking mechanism somewhere along the way. If your fuel line uses the garter style connectors like mine the filter you need has longer inlet/outlet fittings. This thread from another forum briefly touches on the differences between the fittings:How to change your fuel filter. - FSB Forums

Here is a photo of the Fuel Pressure Regulator from Bill aka subford:

 

You may also want to pull the vacuum line off the EGR valve and see what happens.
A another poster had a similar problem and the EVR was always applying vacuum to the EGR valve.
Put your finger over the line you pull off and be careful not to break the vacuum line as they brake very easily.

 

I have a 1994 Ford F-150 with a 5.0L. This has been giving me fits for over a year and I'm looking for some help.

Most often than not, the truck starts on first crank. But when I try and drive, it starts running very rough and the exhaust smells very rich. Other times the truck won't start, acting like its starved for fuel, but when I give it gas, either tapping the throttle or putting it to the floor, it barely starts and runs very rough. It has dual tanks but only 1 fuel filter (at least that I've been able to find) and I created a new dictionary of 4 letter words while trying to get Ford's wonderful "quick" disconnect fuel lines off the filter. I've been told to check (or rather replace) the Fuel Pressure Regulator but I've also read and heard that its a pain in the rear end to replace on your own. I'm a fairly novice mechanic and can do most basic tasks, but I'm wondering A) on a scale of 1 to 10, how hard is it to replace the FPR and/or B) if anyone has any other (easier) ideas on what could be causing this. This problem started out of the blue on a truck thats been very well taken care of and I'd love to get running again.

Thanks in advance!

 

Pull the vacuum hose off the Fuel Pump Regulator (FPR) and turn the key on and then off with a cold engine.
If fuel comes out of the nipple on top the FPR it is bad. If no fuel come out of the nipple the FPR is more than likely a good one.

The fuel filter is more than likely OK unless you have bad fuel tanks. Changing the fuel filter will not help with bad tanks as it will plug up again.