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Re: Fuel pump roulette
In a message dated 97-10-20 18:03:04 EDT, you write:
<< Anyway, I have the same question...as Phil's above. And, is it
> considered as a "dirty" marketing strategy from Audi (or whoever
> the TSB) to encourage all of us to remove the "lower screen"
> permanently so it will shorten the life of the FD. Then, all of us
> would have to replace the Fuel Distributor sooner than its normal
> (Of course, if there is no "lower screen" to trap the "garbage" from
>the FP, those "garbage" will pass to the FD, and then, injectors. Pls
>correct me if I'm wrong. The damn FD is not cheap + replacing the
> injectors is a major PITA. May be I'm too cynical.)
> Can some experts on this topic shed me some (more) lights. (I don't
> want to play the FP-roulette.)
I'll risk the caps. THE FP SCREEN IS REDUNDANT.
Here's the deal. There is a screen that sits in the plastic tank baffle.
The FP sits in a plastic seal that sits down into the baffle with the
screen. Audi, with the TSB is eliminating 1 of 3 safeguards to EXTERNAL
schrapnel. 1 is the baffle screen, 2 is the FP screen, 3 is the FF. 2
safeguards is plenty for EXTERNAL. For the INTERNAL FP derived schrapnel,
think of it this way:
Assume the FP is loud cuz it's screen is clogged. Since the FP schrapnel
(INTERNAL SCHRAPNEL - defined) will start upstream of BOTH the FP screen AND
the tank baffle screen, the only thing that is saving the FD is the FF. So
eliminating the FP screen is hardly a risky proposition in this case.
FYI, I saved the FP screen (per TSB cause: brown silt from tank liner
material clogging FP screen = loud FP symptom). Holding it up to light shows
that about 10% of the area of the screen is free. Not good.