924Board.org

[RexS]

I've got a 1980 924 n/a that has been sitting for 6 or so years and I have been going through the brakes and the fuel system in preparation of a summer of fun driving.

The high pressure fuel pump was not functioning so I bought a replacement. I clamped the low pressure rubber hose line from the tank pump and removed the old pump. Even on the bench, it was dead. It took me two days to acquire and install the replacement and when I took the clamp off of the low pressure side, it would not expand. I got a new length of 1/2" fuel line (not many places had that, by the way) and removed the old line.

I cut the line in several places to see what it looked like and I was shocked at the deterioration of the inside of the hose. It had an effective diameter of perhaps 1/4"-- maybe less. I'll bet the high pressure pump was starved from time to time.

I've read that it is difficult to replace the fuel lines in the tunnel because of poor access. How much of the fuel line in the tunnel is rubber? Has anyone else found their fuel lines to be so shot? At least it is the high pressure side....
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80 924 n/a
98 Sebring Conv
95 Mustang
97 Honda ST1100

[Brendan]

I'm midway through that process now. The fuel lines on my 77 are not in the tunnel, they run along side. They are all steel. There's a hose from the steel line to the fuel pressure damper, and another from fuel filter to the supply line in the engine compartment.

I wound up replacing them all with a combination of steel lines and braided stainless AN line. That is a pain in the A, because of trying to find the parts to go from 45* flare to AN fittings, though I'd rather spend the money on the AN fittings than try to bend the complicated lines that run up and over the transmission to the fuel pressure damper. I did those in AN-6 braided stainless, and am glad I did.

I had a mess of varnish in the tank, too, which has been a major pain as well. If you start seeing that, I can lend some advice on that issue, too.