NO codes, fuel pump runs non stop when key is on.

[RebBronco]

Ok boys, I have a 1990 351 powered Bronc and I have a few problems.

1. Fuel pump stays running

2. No codes in KOEO

So I have pulled and replaced my fuel regulator and filter and this is still doing this.Any ideas?

 

[BroncoJoe19]

Ok boys, I have a 1990 351 powered Bronc and I have a few problems. 1. Fuel pump stays running

2. No codes in KOEO

So I have pulled and replaced my fuel regulator and filter and this is still doing this.Any ideas?

This is one time that I am going to recommend changing a part without troubleshooting.

It is probably your fuel pump relay. it is located on your driverside wheel well.

It is about $10.

If that is bad, it should have thrown a code, but for $10 and as easy as it is to get to, I would just swap it out anyway.

 

[RebBronco]

Well swapped out the relay and it is still doing it :angry: Well, now that I have snow on the ground again, what should I do next?

This is one time that I am going to recommend changing a part without troubleshooting.
It is probably your fuel pump relay. it is located on your driverside wheel well.

It is about $10.

If that is bad, it should have thrown a code, but for $10 and as easy as it is to get to, I would just swap it out anyway.

 

[BroncoJoe19]

Well swapped out the relay and it is still doing it :angry: Well, now that I have snow on the ground again, what should I do next?

$hit! That was suppossed to be the easy answer!

I don't know... I am assuming that it is EFI and Not carbureted correct?

How is your truck running?

I would do a fuel pressure test next. Perhaps your pump is weak and although working, not really generating enough pressure to reach whatever the cut off point is.

 

[BroncoJoe19]

$hit! That was suppossed to be the easy answer! I don't know... I am assuming that it is EFI and Not carbureted correct?

How is your truck running?

I would do a fuel pressure test next. Perhaps your pump is weak and although working, not really generating enough pressure to reach whatever the cut off point is.

I did a search, knowing that I had seen this issue before and wonder what other info may be halpful.

Miesk5 suggested...

Check the EEC relay also to see if it is hanging up

 

[RebBronco]

She runs good.

Already replaced the EEC relay so next stop is fuel pressure. I will get back to y'all when the snow melts and I can get to the Bronco.

I did a search, knowing that I had seen this issue before and wonder what other info may be halpful.Miesk5 suggested...

Check the EEC relay also to see if it is hanging up