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The pumps don't usually suddenly fail. But what can happen is they may get jammed with a piece of grit. They are still in good working order - if you can dislodge the grit. I have had this more than once between my SC and 930. Especially if they have been sitting for some time.
You can have success freeing them if they are jammed, by reversing the power feed and flicking the power on/off. Then run it backwards if it frees. With fuel going thru to flush it. You need to remove the pump to do this. I have managed to free them this way probably 2/3 of the time . You have to be careful not to over stress them while they try to start and can't run. They get hot. And you can snap the drive piece connecting the motor and the pump. In which case nothing lost - it wasn't running anyway.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
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