[T2] Power loss in 4th

[Avocado Tom Tarka]

All,

Quick update...

Of the suggestions I got regarding my power loss, I got:

1. Vapor Lock
2. Blockage in the fuel tank
3. Fuel Filter
4. Fuel pump
5. Float Valve
6. Coil
7. Verify everything ignition oriented

Since then, the problem has just gotten worse: the engine now cuts out and
dies after warming up, on flats and and hills. It'll start again after a
minute or two, only to die.

I'm guessing it's either the fuel pump or a blockage in the fuel tank, but
I'm wondering: could it be bad gas?

I've ensured the timing and dwell is dialed in, swapped in a known good
carb & new coil, and replaced the inline fuel filter.  I also verified all
of the fuel lines were far from heat sources (one was close, but most were
far away).

I will be trying a new fuel pump next (don't have a spare and wanted to
test what I had first, especially given the fuel pump is new) and draining
the tank after that.

Thanks for all of your thoughts and ideas so far...I'm making incremental
progress.  :)

Cheers,
   Tom

---
  "We are MoTown.  We are professionals.  We're here to get the job done."

On Mon, Oct 12, 2015 at 1:24 PM, Avocado Tom Tarka <avocadotom at gmail.com>
wrote:

> Hi volks,
>
> I'm encountering some power loss issues which I'm hoping someone can
> provide insights on.  After about 30 minutes of driving and when my bus is
> fully warmed up, I'm experiencing power loss and sputtering.
>
> Data points:
> - only happens when going uphill, particularly with steep grades
> - happens primarily in 4th but may just be RPM related: it seems to occur
> below ~2500 rpm (just noticed it in 3rd)
> - new fuel pump
> - hear ticking sound from carb after stopping to cool down (like a wind-up
> kitchen timer ticks)
> - watched fuel getting sucked through pre-carb filter after stopping to
> cool down
> - fuel pressure verified to be 2.5 to 3 psi after installing new pump
> (IIRC)
>
> Bus also seems to be trending towards overheating when the power loss
> occurs. Not sure if that's related.
>
> Specs:
>
> 1971 bus
> 1600 SP engine
> Non-doghouse oil cooler
> 009 and 30-pict 2
>
> I'm guessing it's the fuel pump, or float, as the gas tank was recently
> cleaned, but I'm at my wits end.
>
> Any thoughts?
>
> Thanks!
>    Tom
>
> ----
> "We ----
>  "We are MoTown. We are professionals. We're here to get the job done."
>
>