Sorry, forgot to include attachment.  ;-( 

 

 

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.

 

 

Did a Google search on “VW Jetta fuel system”.  Here is a cut-n-paste from the very first hit. 

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. 

 

 

----- Original Message ----- From: Mark R Steitle

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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?