so filters werent the problem...im lookin to replace my fuel pump, is there a difference between s4 and s5 pumps? or are they interchangable?91 na

 

i think the wiring may be diffrent but they both drop in

 

No idea, but I have a good fuel pump from a 91 NA for sale. PM for details.

 

S5 -> S4 with a little lengthening of the hose.
You cannot go backwards.

The S5 fuel pump assembly bracket uses a special rubber(?) flex fitting that fits snugly on top of the fuel pump.
The S4 fuel pump output fitting is too long to fit correctly.


-Ted