Fuel pump issues

[chezz]

Total silence from the pump and not a drop of fuel at the meter head. Can I run a direct feed from the battery? What voltage reading should I be receiving at the pump?

[Phil Payne]

Originally Posted by chezz

Total silence from the pump and not a drop of fuel at the meter head. Can I run a direct feed from the battery? What voltage reading should I be receiving at the pump?

Pull the fuel pump relay out.

Pull out the copper bridge two places to the left and push that in the fuel pump relay's place. Dependent on any tricks the immobisiller apes have pulled, the pump should run even with the ignition off.

[chezz]

Cheers Phil, I will have a look tomorrow - hopefully.

[droopsnoot]

Mine was the fuel pump relay - the vertical bit of the circuit board had come loose from the horizontal bit, looked as if the solder holding it all together had failed.

[Remco]

This might be of some help:

Fuel Pump Relay Mod

Cheers from holland.

[Mark Hanman]

the contacts in the fuse box/relay box can have a tendency to relax, making a poor contact.

[chezz]

Originally Posted by Phil Payne

Pull the fuel pump relay out.

Pull out the copper bridge two places to the left and push that in the fuel pump relay's place. Dependent on any tricks the immobisiller apes have pulled, the pump should run even with the ignition off.

No voltage showing at the pump, bridged the relay and voltage is detectable.The fuel pump is juddering and making very strange noises - obviously cream crackered. Replacing the relay shows no voltage and silence at the pump?
Battery is also totally on its way out, which is not helping matters.

[Julian]

Originally Posted by chezz

No voltage showing at the pump, bridged the relay and voltage is detectable.The fuel pump is juddering and making very strange noises - obviously cream crackered. Replacing the relay shows no voltage and silence at the pump?
Battery is also totally on its way out, which is not helping matters.

Remember that a worn out pump draws more current than a good one - this causes hot wiring connections, oxidisation and higher resistance etc. You could therefore have engineered yourself more than one fault

IIRC circa 8 amps is the sign of a healthy pump?

[Phil Payne]

Originally Posted by Julian

Remember that a worn out pump draws more current than a good one - this causes hot wiring connections, oxidisation and higher resistance etc. You could therefore have engineered yourself more than one fault

IIRC circa 8 amps is the sign of a healthy pump?

9 amps is the official in-the-duckpond figure.

[JimH]

It sounds to me that you may have a failing pump which has gradually drawn more current and burnt the contacts in the relay.
Now with the relay in circuit you get nothing at the pump, and with the relay bridged you get a bad sounding pump.

First, inspect carefully the inline connector (looks like an inline fuse holder) to the fuel pump under the rear seat. Those connectors burn up over time, especially if the pump is bad.