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<x-charset iso-8859-1>Hello- > I agree with Keith's comments about filters on the oil pump inlet, but all the D- > Jetronic cars have both gas filters on the inlet side of the pump. This still > causes no problems because the flow rate is relatively small, as is the > viscosity. > > Later FI systems went to putting filters after the pump. The only difference I > can see is that this keeps wear particles from the pump from making it into > the rest of the FI system. That and the fact that the filters have to take > pressure, so they cost $25 instead of $5. It is a general rule-of-thumb to put filtering on the pressure-side of a given system if possible as it typically results in better filtration. This is true of many systems (not just automotive alone). It is also a general rule-of-thumb to put a very coarse "filter" ahead of the pump on the suction side to keep out large particles (like the sump screen). Sometimes, of course, cost and/or complexity get in the way, but generally for good filtration, it is highly preferred to follow the rules... Take care, Shad Laws LN Engineering - Aircooled Precision Performance http://www.LNengineering.com ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/ </x-charset>