08 F150 Triton 5.4 - OK, I have an issue. Long story. Truck wouldn't start one morning. Noticed I didn't hear fuel pump. Replaced fuel pump, and same thing. Pulled fuse block, took apart, took to master electrician, relays tested fine for fuel pump. Found it was the fuel pump module. Replaced. Truck started. I drive 5 minutes 1 way to work. Truck runs fine, sometimes takes a little more to start. Take it to next town over a few weeks later. While at gas station, left truck running with wife and kids. Came out with drinks, opened door, truck dies. It cranks, but does not start. Had towed to Ford dealership. They jumped next morning. They said battery was bad. Replaced battery under warranty. Truck runs fine for another week just to work and back. Took to another nearby town last week for Christmas shopping. Wife and kids stayed in truck. Left it running. Wife calls me while inside, said truck just died. Again, just cranked and would not start. Ford sent out a guy with jumper cables, just cranks, no start. They decided to bring a big jumper pack out. So after truck sat for 35 or 40 minutes, guy gets there, and truck starts. Drive truck 20 minutes back home. One block from home, truck dies while driving. Waited 45 minutes, and truck would not start. Had a friend pull to Ford dealership. Next nor ING, I get a call that it started. Took a few cranks more than normal, but started. I told them to keep it and drive it. Take it home, I don't care. I can't be stranded with kids in the winter time, and it has stranded me 2 times, and died while driving.

I have not received a call from ford yet, and they have had it for a couple days.

Anyone have any idea what would be wrong? It idled for about 10 minutes each time it died, and the last time was while driving.

 

Does it like putter and then and die, or just go off like the key was turned off?
I would check out the crank position sensor and it's wiring condition if it just shuts off, as the coils and injectors shut off if this is bad.

If it sputters out before it does I would keep looking at the fuel delivery, as it will run until there's not enough pressure, like running out of gas.

 

It just dies. What is weired is I had no issues until the first time it didn't start, and replaced the fuel pump and fuel pump module. I wouldn't think that would have an affect on the crank position sensor. I will call the dealership tomorrow though and see if they can make sure that's not the issue, as well as see if they maybe figured it out, or if it left their tech stranded on their way home with it.

 

The FPDM (Fuel Pump Driver Module) is a known problem on the 2004-2008 F150s. There are many many posts on this issue. If you used a genuine Motorcraft part (there are counterfeit out there) you probably have a good one. Aftermarkets have, what I consider, a high failure rate and even the new one are sometimes bad out of the box. Is Ford is doing your work or are you willing and able to get dirty?
Here are a few things to consider

• Ground wire for FPDM. Occasionally the ground connection is the problem and it should be inspected. I will post a photo of ground number G401.
• Buy a can of starting fluid and put it in your truck. If you experience the no start issue again you can confirm or rule out a fuel delivery issue by removing the air inlet hose to the throttle body and squirting a little starting fluid into the throttle body as the engine is cranked over, if it starts or attempts to start while the starting fluid is being sprayed the you have a fuel delivery issue.
• In a no start condition, caused by fuel delivery issue, you can (its under the truck near the rear axle), jumper the connector for the FPDM ( it dangling in my photo and videos etc on line) and cause the Fuel Pump to run full time to get home or to the dealer. Its much easier than you would think.

Please report back as this issue is resolved. Many, many of the posts in this forum (and others) are open ended. Problem stated, solutions suggested but no closure. Please post feedback that allows future readers to understand and consider your experience with the issue.

 

Duplicate posting, see above

 

The after replacing the fuel pump and checking the relay, I found out about the fpdm. I did jump the pins for the old one before replacing. That's how I found out that was the definitive issue the first time around. I replaced it. The first time it left me stranded, I crawled under the truck and jumped the pins again and it didn't start. I will have Ford double check it when I call them today.

I am not afraid to get dirty. I took time off to replace the fuel pump and the fpdm. After leaving me stranded, I figured it was better for them to track the issue down, and I am out of vacation now.



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