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Well, maybe that’s worth noting…
“If you put the filter before the pump, then use filters with oversized
inlets/outlets.”
From: Rotary
motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Echo Lake Fishing Resort
(Georges Boucher)
Sent: Thursday, July 28, 2005 3:36
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: fuel
filter question
II have an old
Eagle Medallion that my maintenance crew uses around the
resort it has the filter before the pump. One thing that I did notice
was that filters before the pump have large inlets 13 or 14mm, both the
filter & the pumps are very close to the tanks (pumps push better than
they suck)
-------Original
Message-------
Subject: [FlyRotary] Re:
fuel filter question
I guess I’ll have to take your
word on that one George. I haven’t seen a Renault in Texas in quite a
while.
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Echo Lake Fishing Resort (Georges Boucher)
Sent: Thursday, July 28, 2005
3:13 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: fuel
filter question
Renault has the
filter before the pump.
-------Original Message-------
Subject:
[FlyRotary] Re: fuel filter question
A little more
searching and I found a schematic of a Peugeot on the Bosch web site.
Both diagrams show the tank, then the pump, then the filter. Not that
some others don’t do it differently, but I haven’t seen any.
I think there is a good reason the designers put the filter downstream from
the pump. As Tracy
has pointed out before, efi pumps don’t suck very well, they are
designed to push fuel at high pressure. My system has coarse screen
filters in the tank, and two efi filters downstream from the pumps.
Caveat… I have done 9 hours of ground testing, but no flight test as
yet.
Mark S.
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Mark R Steitle
Sent: Thursday, July 28, 2005
2:47 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: fuel
filter question
Did a Google search
on “VW Jetta fuel system”. Here is a cut-n-paste from the
very first hit.
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1985 Volkswagen Jetta NHTSA Recall
ID Number: 87V053000
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Recall Date: APR 14, 1987
Component: FUEL SYSTEM,
GASOLINE:DELIVERY:FUEL PUMP
Potential Units Affected:
278520
Summary: FUEL PUMP, LOCATED INSIDE FUEL TANK, COULD SEIZE
DURING HIGH AMBIENT TEMPERATURES BECAUSE OF AN EXTREME FINE MESH FUEL
FILTER RESTRICTING THE FUEL FLOW.
Consequence: FUEL SUPPLY TO
ENGINE WOULD BE PARTIALLY INTERRUPTED,RESULTING IN STALLING.
Remedy: INSTALL A MODIFIED
FUEL PUMP AND FILTER.
Notes: VOLKSWAGEN OF
AMERICA,INC,
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Mark S.
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of jesse farr
Sent: Thursday, July 28, 2005
2:42 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: fuel
filter question
Isn't the
reason for that most efi cars have pump in tank so would be kind of hard to
do ?
As I recall, putting
the filter between the tank and pump was true for the pre EFI cars, which
were prone to vapor locking. But I can’t think of any of the
newer EFI cars that put the filter before the pump (excluding screen
filters). Can you provide any examples?
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