I am running out of gas with 1/4 to 1/2 of a tank of gas showing on the guage at approximatly 500km on the odo. The tank is supposed to hold 93 litres. When I fill up it will only take 65 litres. I think the problem is part #6 on the attached diagram. This pumps gas from one side of the tank to the sending unit.... (I think)
Has any one ever had this problem?

No. Description Supplement Qty From Up To Part Number Price Notes 01DELIVERY UNIT, RIGHT116116755043$279.0002RUBBER SEALING21614014141202RUBBER SEALING216141182905$2.3403LEFT FUEL LEVEL SENSOR116116762044$32.6404O-RING22X2MM FPM116116761645$0.6205SCREW CAP208/200316141182904ENDED06CABLE SET F TANK WITH SUCKING JET PUMP116111184427$101.8407PLUG HOUSING ON REQUEST16113333333308SOCKET HOUSING6 POL.161131387190$7.03ONLY IN CONJUNCTION WITH--RUNDSTECKH0,75-1,0 MM361130007569$1.95--RUNDSTECKH1,0-2,5 MM361130007571$1.9509PLUG HOUSING ON REQUEST161133333333