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camerontech, Auto Service Technician
Category: Ford
Satisfied Customers: 480
Experience:  diagnostic auto tech
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2004 ford f150 with a 5.4L V8. Runs fine minutes, then runs

Customer Question

2004 ford f150 with a 5.4L V8. Runs fine for 15 minutes, then runs poorly. When shut off for 15 minutes, it will not start. Tries to start, but just sputters. Then and hour or so later, it starts just fine. (replaced the fuel filter - no change).
Submitted: 1 year ago.
Category: Ford
Expert:  camerontech replied 1 year ago.

hi there,

im cam, a licenced diagnostic tech.

It sounds like a faulty fuel pump driver module

These are a common issue on these.

they are located at the rear of the vehicle on the frame close to the spare tire.

they are bad for splitting wide open from corrosion and you can usually see it through the rear wheel well.

if there is any corrosion seen on this module , replace it

Expert:  camerontech replied 1 year ago.

let me know how you make out!

thanks and i appreciate positive ratings!


Customer: replied 1 year ago.
just replaced the fuel pump driver and the same results. Runs fine for a while, then when shut off for 15+ minutes, it will not start and keep running. There goes $105. What is next??
Expert:  camerontech replied 1 year ago.


is there any codes stored in the system?

if so, record them and look at the freeze frame screen. this will show all of the data when the code was stored... very usefull.

when it is in the no start condition, we will have to find out if it is missing fuel pressure or spark.

hook a fuel pressure gauge up when it is in the no start condition and monitor the pressure.

check the injector pulse, as a shorted injector can shut down the whole bank of injectors. you can usually see this when scoping with a amp clamp.

even unplugging one at a time can pinpoint this, if a injector is heating up and shutting the system down.

check the spark in all of the cylinders, it should be a strong spark.

these are the next steps as we have to find out what is missing... fuel pressure, injector pulse and spark.