Car will not start

[geebob]

Repaced crankshaft position sensor and the car still won't start sometimes. Very good cranking power. No pattern whatsoever. It now appears there may be an issue with the fuel pump. When I turn the key I no longer hear the pump engage. Dead pump... correct?

 

[Blee1099]

If you can't hear the fuel pump, chances are its dead.. I would first check to fuel pump fuse/relay to make sure its good..

 

[geebob]

Fuel pump relay

How would one test the fuel pump relay?

 

[MrShorty]

You could try listening for a "click" as the relay closes, but I think the only way to know for sure is with a voltmeter. Get a wiring diagram so you can see how it's wired in, then go through the process of seeing where the circuit is broken.
It seems that I see some people who thought they had a bad fuel pump relay who later find out that they had a bad EEC relay (which feeds power to the fuel pump relay). Just to say that it can be important to go through the entire circuit somewhat systematically.
And, one last note, the fuel pump circuit isn't continuously energized unless the engine is running. The computer will operate the pump briefly when the key is turned on, then waits until starting the engine to turn the pump back on.

 

[pmcmaster]

If you have a Bosh immobiliser see my thread on 'Bosh Immobiliser controls fuel pump'. It isnt until you see the wiring diagrams for this Immobiliser that you realise that it has its 'finger in every pie' , fuel pump, ignition circuits, starter motor, central locking, even a 'tamper' detector wired across the ignition switch. As Mr Shorty says, you must be systematic in this, dont forget to check that the fuel pump inertia switch hasnt 'popped'.