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
|
|
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,
|
|
|
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?