AO Platinum Member
Join Date: Feb 2002
Location: The land that Time forgot
Re: lost feed to fuel pump + no spark
With the ignition on, you should b able to hear the fuel pump running (stick you head in the boot), regardless of any other problem (such as a TDC sensor failure etc.).
You probably disturbed the fuel pump relay and/or fuse.
They are the middle one of the three pairs of "relay & fuse" which you'll find under the black plastic cover next to the power steering fluid reservoir (in the engine compartment, above the steering wheel).
The righthand fuse/relay as you look at them is for the lambda sensor and the lefthand fuse/relay look after the ECU (from memory).
Anyway, take each relay and fuse out (do them one at a time so you're sure you return them to the place they came from) and check the connectors.. They're alloy and tend to go a bit corroded over time. Clean them up with some emery paper and see if that restores the circuit.
If you think the relay is duff, you can swap the lambda and fuel pump relays - they're the same (but double check that's true of your car). That will at least allow you to see if the different relay makes your fuel pump work (it won't matter if the lambda temporarily has a duff relay running it).. but it's unusual for a relay to fail. It's more likely to be a connection.
The circuit is pretty simple.. mechanics who don't know Alfas end to suck air through their teeth and mutter about not having a wiring diagram... but there's no weirdness going on, or any "mythical component" that disables the coils etc. if something else isn't working, so don't let them frighten you.
If you have power going into the relay, the fuse should also be live.. if you disconnect either, the power going to the lamda sensor relay (and the fuel pump obviously) is cut.
If you have a trip switch under the passenger seat make sure that's not activated (press the button in) and no matter how much anyone insists, you don't have a "missing" fuse box by the n/s wheel arch - Ssome mechanics will insist - but they're looking at a wiring diagram from a 4-cylinder car (often the only one they'll have available).
The rest is glorified Fiat Tipo. An auto electrician will be able to run the usual electrical tests to track down what's live and what isn't, if fiddling with the relays doesn't work.
No bullets for Chaingun..