IP pump going TU.?.

[RossCo]

Ok gents putting this out there just to see if yall come to the same conclusion I am.

Truck starts fine hot or cold. Lots O white smoke on start up, idles fine most of the time. Every once in a while sounds like it has a miss. While driving ( it gets interesting) at times truck will act like it's going to fall on it's face then pick back up, or out of no were find hp it doesn't normally have.

Things I've tried..
- new fuel filters (of course)
- new lift pump
- praying to sweet baby jesus and the IDI gods it's not the IP!

 

[Clb]

Old *** i.p.?!
Anything WITH over 100k is OLD...
Oh and
Do fill in your sig line with the rigs statts!
That way we can see whatcha got, helps with 20 questions.

 

[RossCo]

Yes, I'm sure quite old.. I've had the truck for about 8yrs now and put a lot of miles on it. I know for sure it's had one new one before (when I was like 9) but, I believe it's actually had at least two.

Thanks for the sig heads up, make a lot of cents.

1985 Ford F250
NA 6.9 IDI (420,000 original miles)
Purchase new off the showroom floor by my grandfather.

"I'd rather be forgotten than remembered for giving in"

 

[IDIBRONCO]

It sounds like air intrusion to me. That will cause the power loss/gain while driving. It can also explain the occasional miss. As for the smoke at start up, it could be that thee timing is slightly retarded.

 

[RossCo]

Hmmm... I'd be surprised but, that's an easy diag with the clear hose mod. that I haven't done yet.

I pay pretty close attention the fueling system. I would expect to see some leakage from the area that is allowing air into the system. Is this a flawed expectation?
Thanks for the idea brother definitely something I'll look into either way.

 

[DrCharles]

Depends on the leak. Plenty of people here have reported air intrusion problems with nothing dripping visibly...

 

[typ4]

Depends on the leak. Plenty of people here have reported air intrusion problems with nothing dripping visibly...

This ^^^^^^^, in a nutshell.
https://russrepair.com/

 

[Selahdoor]

This ^^^^^^^, in a nutshell.
https://russrepair.com/

Is that you?

 

[Clb]

We have been waiting for Russ (type4) to leak the address for awhile...
op listen to him.
he is a busy man so be patient

 

[RossCo]

Yep, no worries. I'll report back when I have more info. The reason I'm on here asking is so I don't overlook something stupid and spend a lot of $ to still have a problem.
My gut does tell me it's the IP just from age but, I certainly want to rule everything else out first.

 

[IDIBRONCO]

My gut does tell me it's the IP just from age but, I certainly want to rule everything else out first.

I don't thin that a wore out pump will cause the power gain/loss symptom.

 

[ISELLTRUX]

Corroded/Old rubber and hard plastic fuel lines caused blockage in my fuel system and tank switch controller. Caused an immediate shut down of engine due to loss of fuel. Just my 2c!

 

[gandalf]

Is that you?

Yes, that's our very own Russ.

 

[RossCo]

Installed a clear line from the injector return at the from of the motor to the fuel filter head. No air bubbles so far. Haven't had a chance to do the lines at the rear yet.

 

[RossCo]

What are the possibilities of a sticky metering valve??