Fuel pump? FPDM? Regulator? ideas?

[Rickozx]

I have this problem that developed, please listen to both sound clip (30 seconds each),

first from the engine bay

http://www.youtube.com/watch?v=woruwxV_7qw

You hear the idle is not regular, it want to stall and come back regularly.

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Now listen at the sound near the gas tank

http://www.youtube.com/watch?v=--DF_T48I68

I hear a kind of "pshhht" every 4 seconds or so, right at the time the engine want to stall.

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A little history about the problem.

First show 2 weeks ago, sometimes starting the truck it would stall right there, and idle strange like this at the second start, then settles after 10-15 seconds and the engine run perfectly fine after that. It lasted 2-3 days then disapeared, so i thought water in gas or something.

Now today it begin to idle strange like this after 5 minutes warmup, then do it always, when i drive also. It cause the truck to jerk forward when power come back, and then die, etc. It also do it in neutral, when i rev the engine at says 2000rpm, it cut and come back like this.

So now it's undrivable safely like that.

But i'm a little lost where to search. Such a regular sound tell me it's electronic ? How is the fuel pressure regulator on those truck? Electronic or mechanic? In the tank or somewhere else?

No check engine light, can i still pull some code even if the CEL never lit (yet) ?

Truck have 62 000 miles, just out of warranty. I bought it last summer so unsure or what have been done and not mechanicaly.

Thanks for your help!

 

[Loren R]

Rick, based upon your descriptions of the problems, I'm pretty sure that there is nothing YOU can do to fix these problems. You need to take the vehicle to a shop and have a mechanic check it out.

 

[Rickozx]

Well i would say the opposite. I fixed it laying under the truck in my driveway (in the snow).

It was the FPDM, that little module that drive the fuel pump, under the bed. Total cost 100$, saved a couple hundreds doing it myself

 

[Loren R]

So, you posted a question for help, received no replies as to how to fix it, and 8 days later it's suddenly fixed with a "simple" repair??

Wish all my questions worked that way. Good for you.
Loren