Hi all,

I know that the answers to this question can be anything from a-z, but I would still like to get some ideas on where to start looking.

5 days ago my enginge dies on me while i was out driving, started with a couple of missfires, and then died.
At first I thought that I maby had run out of gas, because of the symtom.
I pulled of the road any tried to restart.
• Cranked, but nothing.
Waited approx 2 minutes, checked the air filter.
• Cranked, and the idle was horrible! missfied a lot, irratic idle and then died.
Shut of and waited 10 minutes.
• Cranked and wokred fine.
Drived for 2-3 minutes and it started to missfire and died again.

Can this be something heat-releted?
What can it be?
The car is now sitting on my driveway

/Martin

 

Sounds most like a fuel delivery problem.

That means fuel filter, fuel pump, or the electrical supply for the pump.

Start with the filter. It's a maintenance item anyway and could be the reason.

If it isn't the filter, you'll have to diagnose whether it's the fuel system or is something else.

That means a fuel pressure guage, a meter, and the diagnostic procedure.

Try cycling the ignition switch to RUN, wait two seconds listening for the hum of the electric fuel pump. Turn OFF. Repeat several times, then try hitting the START. If it starts and runs better for a little bit, then you definitely have a fuel delivery problem.

Steve

 

missfire.. spark plug perhaps? A syptom of running out of gas.. like lurking forward, I had that in a GMC Seirra, ended up being fuel pump like project said.

 

check the MAF sensor.. or for a vacume leak. and then go for the ignition problems

 

Yesterday while i was changing the fuel filter I decided to test the fuel system.

I don't know if I´m thinking right here, but I guess that I'm right.
If i disconnect the fuelline before the filter and then turn the key to run(not start) shouldn't the fuel pump start running and try to fill the system?
The disconnected line should spray fuel all over.

What happens is that it just dripps a little.
So I'm guessing that the fuel pump is bad.

Please correct me if I'm wrong.

 

I don't know for sure, but that sounds logical to me.

Why don't you call the dealership and ask?

 

I went to the ford dealership and asked the guy at the sparepart counter.
He said that if the pump worked and it had power, the open line would leak all over.

Tomrrow I'll ask a coulpe of neighbours for help and we'll push the truck into my garage and over the grease pit. Then I'll unmount the tank and see what I can find.

 

Could be alternator or loose battery connections too?>

 

Of course, getting fuel pressure does require that the pump get electrical power.....

The pump should cycle on for about 2 seconds when the key is first turned to RUN.

The guy behind the counter was too kind. If the pump were working, it wouldn't just leak, it would spew out under significant pressure. Remember, these pumps can transfer up to 30-40 gallons per hour with no back pressure.

Steve

 

Last week i unmounted the tank and took the fuelpump&sender out of the tank.
I ran the pump with a battery charger to see wether it would run or not, and it did.
I havn't had it pressure tested yet, but will do that. Or maby i should just get a new one, the truck has 110000miles on it.

There are two fuel lines in the pump/sender unit, and i guess the one not connected to the pump is the fuel return line. On the end of this tube there is something that looks like a rubber check-valve.
I don't understand why you would need a check-valve here, to stop the fuel from flowing in the wrong direction when the engine is shut of?
I know there is a check valve in the pump to maintain fuel pressure when engine is shut of, but when I'm talking about is the fuel return side.
Anyways... this rubber-thing was broken, and it was resticting the end opening of the return tube.

This MAY have been causing a problem but I'm not sure.
Can i just skip this "rubber check valve", or do I have to get a new pump/sender unit. I don't think I can find this "rubber check valve" at ford.

 

I'm not familiar with what you're talking about, but check and see if the pump is getting electricity when you turn on the key. Seems to me that if the return line was stopped up, it would still run. But that's my guess. I know very little about the fuel delivery system on our trucks.

 

Just wanted you guys to know that I replaced the fulepump with a better one and everything works fine since then. Also got a couple of extra HP's