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About 10 days ago I posted about my 1985 900T that died on the road. I was leaning towards fuel pump and asked for advice. Anyway, here's what I learned:
A week ago while driving home it quit- coasted dead to a stop with no drama- just red lights on the dash. Cranked but wouldn't fire. Towed it home and started poking around. I was thinking fuel pump, since I couldn't hear it prime up or run while cranking. I jumped the fuses and it ran. I pulled the rubber pump cover and saw the small pump was splashing fuel ok. I pulled both relays from the rack over the FI box (why did the trolls put it there- passenger footwell??!). Both checked out OK by the Bentley manual. I jumped the fuses to make the pump run and tried to start- nothing. Ran all the fuel diagnostics I could without tearing out the dash to get at the relay sockets.
Reading that the FI brain also needs a signal from ignition before it will run the pump (hmmm...), I figured I'd better at least confirm spark. No spark! Ran through the Hall efffects, ignition module, coil checks, all was OK. However- I didn't try to start it after each check- just power on, check, power off. The final one was to turn the engine over while looking for the voltage change at the ignition module. When my lovely assistant started to crank it over it fired up! So I must have had a bad electrical contact somewhere (coil??). Runs fine now.
Note to self: before spending a weekend taking apart the fuel system and scratching head, take 3 minutes to confirm the other side of package is working first!! DOH!
posted by 24.39.85...
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