Engine struggling after stopping and restarting. Ideas?

[ManyRifles]

Hey friends - I am having this weird, ongoing issue with my 100-series where I drive a considerable distance (at least an hour or so), stop - the engine is still hot - and then the truck is having issue starting back up again, struggling, and then even dying in the parking lot.

The prime example would be - driving home from work (long commute), stop at the store to grab "that one thing" and then have the issue in the parking lot.

The shop had a hard time replicating the issue and was pretty stumped. They decided that it may be something with the fuel pump valve - i.e. the fuel pump valve is staying open when the hot engine is turned off, fuel is returning to the tank, and then the fuel has to go a longer distance to get started again - hence the delay, sluggishness, etc. All is resolved once it starts moving again.

To that end, the fuel pump was replaced, but the problem still persists.

In the morning, or when the engine is cold, it starts right up with no issues.

Has anyone ever had or heard of this issue before?

 

[equals340]

Hey friends - I am having this weird, ongoing issue with my 100-series where I drive a considerable distance (at least an hour or so), stop - the engine is still hot - and then the truck is having issue starting back up again, struggling, and then even dying in the parking lot.

The prime example would be - driving home from work (long commute), stop at the store to grab "that one thing" and then have the issue in the parking lot.

The shop had a hard time replicating the issue and was pretty stumped. They decided that it may be something with the fuel pump valve - i.e. the fuel pump valve is staying open when the hot engine is turned off, fuel is returning to the tank, and then the fuel has to go a longer distance to get started again - hence the delay, sluggishness, etc. All is resolved once it starts moving again.

To that end, the fuel pump was replaced, but the problem still persists.

In the morning, or when the engine is cold, it starts right up with no issues.

Has anyone ever had or heard of this issue before?

Check the spark plugs and coils

 

[Old Nick]

Hey friends - I am having this weird, ongoing issue with my 100-series where I drive a considerable distance (at least an hour or so), stop - the engine is still hot - and then the truck is having issue starting back up again, struggling, and then even dying in the parking lot.

The prime example would be - driving home from work (long commute), stop at the store to grab "that one thing" and then have the issue in the parking lot.

The shop had a hard time replicating the issue and was pretty stumped. They decided that it may be something with the fuel pump valve - i.e. the fuel pump valve is staying open when the hot engine is turned off, fuel is returning to the tank, and then the fuel has to go a longer distance to get started again - hence the delay, sluggishness, etc. All is resolved once it starts moving again.

To that end, the fuel pump was replaced, but the problem still persists.

In the morning, or when the engine is cold, it starts right up with no issues.

Has anyone ever had or heard of this issue before?

I don't own a 100, but can say from experience that this sort of thing is very common in the 80 series (and I feel your pain). I would check the 100 series FSM to troubleshoot.

Good spark (igniter and coils); fuel pressure regulator; charcoal canister (are you getting pressure build-up in your tank?)... You've already replaced your fuel pump so that should be sorted.... but the list goes on and on. Are you throwing any codes?

Not going to throw out advice from lack of experience with the 100 series, but I will suggest the FSM.

 

[GTV]

What’s the mileage?
No codes?

 

[Trapper50cal]

Vapor lock or Evap. Check the gas cap when experiencing the problem to see if you get excess venting.

 

[ManyRifles]

Thanks, y;'all for the great info.

I will check when I last did spark plugs, but I do have an emissions code - P0441, P0446

Mileage is 237,568

 

[ManyRifles]

Vapor lock or Evap. Check the gas cap when experiencing the problem to see if you get excess venting.

Yes - there is a lot of venting at the gas cap.

 

[Trapper50cal]

Replace the cap with new OEM first...it's way cheaper than the EVAP Charcoal Cannister.

 

[ManyRifles]

Great - thank you, my friend! I'll give that a shot.

 

[J1000]

Fuel pump check valve like the shop suggested could be the culprit. Fuel drains back to the tank but the line is filled with vapors causing vapor lock until the fuel can make its way up.