Reduced power and Reduced turbo boost

[Jay Darst]

The "FUEL VACUUM" gage is now reading very high into the red, which
would indicate that the fuel pump is really having to work(suck)to
pull fuel through the Racor.

I would use air pressure to relieve any blockage in the fuel line
that connects the fuel tank to the Racor, but then how would the
line be refilled so as to avoid air in the line?

With the "FUEL VACUUM" gage reading an unusually high vacuum, I am
fairly certain that this is a fuel delivery problem.

So far, attempted repairs in chronological order:
1.)replace Racor fuel filter
2.)replace Spin-On fuel filter
3.)Again, remove and inspect Racor filter, empty contents of Racor
filter, remove bottom half of Racor filter for inspection and
cleaning.

It appears that the FUEL VACUUM gage is plumbed directly aftter the
RACOR filter, which would place it between the RACOR and the SPIN-ON
fuel filter. That being the case, it would seem that by removing the
contents of the RACOR, the FUEL VACUUM gage would read 0 since there
could would no longer be resistance, hence the RACOR filter canistor
is now empty.

Replaced Racor filter, refilled with fuel and started engine. Runs a
bit un-even. Pretty sure its starving for fuel.

HELP?!

Thanks
Jay Darst
85PT40 6V92
SpringfieldIL
--- In WanderlodgeForum@yahoogroups.com, John Suter
wrote:
> Jay,
>
> I do not want to be an alarmist, however check the
> castings and flanges which deliver the boost air to
> the engine (I think to the aftercooler) for cracks
> that permit pressure leaks. Just before FMCA I saw
> coach with symptoms that you describe, which delivered
> leaking hot exhaust air into combustible areas of the
> engine compartment. The cracked areas, once
> discovered, were barely visable behind the large fan
> but careful inspection permitted first a fingernail,
> then a knife blade to be inserted into the gaps.
>
> John Suter
>
>
>
> --- Jay Darst wrote:
> > Just returned from a 876 mile round trip to Elkhart
> > Lake, WI.
> >
> > Noticed the fuel vacuum gage in the red. So changed
> > Racor fuel
> > before heading back home. Still the gage read in the
> > RED. So, 1/3 of
> > the way home, changed the spin on fuel filter. Still
> > the gage read
> > in the RED.
> >
> > The gage seems to have always worked before.
> >
> > Before and after changing the Racor filter and
> > subsequently the spin
> > on fuel filer, my boost gage would see 20psi.
> >
> > Later, when almost home(and dead dog tired) seemed
> > that power was
> > less than normal and boost would only see 15psi.
> >
> > The last tank of fuel was treated with Lucas fuel
> > treatment, 1
> > gallon Lucas to 300 gallons of fuel.
> >
> > Any suggestions as to why the loss of power and
> > boost with fresh
> > filters?
> >
> > Thanks
> > Jay Darst
> > 85PT40 6V92 Detroit
> > Springfield, IL
> >
> >
> >
> >
>
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