for verifying these. My other revalation, my 1990 300E has the FPR on MAS computer. SO, my next question is to verify if the fuel pumps are working.

upon switching key to "ON" position and hearing the primary fuel pump "preload" the line, would the secondary pump have current going to it as well? Reason I ask is because if it does, all I need to do is check voltage supply to the 2ndary pump and if it's present, the pump should be humming, vibrating or atleast doing something to tell me it's working as well, correct? If not, then I need to remove it and check it manually on the bench.

It is safe to assume that FPR is working because main pump "preloads" on ON position. And there is only ons FPR that operates both pumps?

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a2


1978 280 CE silver
1986 560 SL black
1987 300 SDL cream
1994 SL 500 brilliant green
1997 E 300d dessert silver
2005 FORD F250 Superduty Crew cab 4x4

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