This VERY important check valve is what keeps the fuel from draining back into the tank > < if this is bad it will cause hard starting because the puel pump has to refill the fuel line and the rail > < if the car has been sitting - and the fuel has turned to laquer - replace it > < fits all our cars > < 924s - 944 - 944s - 944 Turbo/951 - 944s2 968 - all these from 1982 to 1995