Fuel system

Nandad · Apr 17, 2018

Hi
Should the fuel pump be running with the ignition on and the engine off?
If not what should I be looking at?
04 plate td4

Jimsky Korsokov · Apr 17, 2018

I think so - should run for 10-15 seconds and then stop once all pressured up (based in my TD5). If you have run out of fuel or changed the filter etc. it can run for a good long time repeatedly to prime. If it runs endlessly - start looking for where the fuel might be going.

Arctic2 · Apr 17, 2018

Nandad said:
Hi
Should the fuel pump be running with the ignition on and the engine off?
If not what should I be looking at?
04 plate td4

Are you sure it is the fuel pump that is running after the ignition is off, and not the FBH pump you can hear, if you have one ?

Nandad · Apr 17, 2018

Sure its the fuel pump - in front of osr wheel.
No signs of external fuel leaks HP pump, pressure sensor, injectors

Arctic2 · Apr 18, 2018

Nandad said:
Sure its the fuel pump - in front of osr wheel.
No signs of external fuel leaks HP pump, pressure sensor, injectors

Arhh yes but the FBH fuel pump is also in the same area place OSR wheel arch.

Nandad · Apr 18, 2018

Thanks for the pictures. You live and learn! Just removed fuses for fbh so isolated that part. Pump still running.
Got to stop now my better half has pulled the garage fuse. She's so subtle!

guineafowl21 · Apr 18, 2018

Your fuel pump relay might be stuck on. Give it a tap, or swap it for a nearby one.

Nandad · Apr 18, 2018

Found the relay, swapped with a proven new one. EUREKA!!!!!! Pump runs for 15 seconds then stops. Many thanks
Jimsky Korsokov, Arctic2 & guineafowl21 for all your help. If ever we meet I owe you one.

Fuel system

Nandad

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Arctic2

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