help cutting out

[stu bag]

Hi all
On my way to work this morning travelling along and all of a sudden the engine cuts out.
pulls over and the imobilizer is not working,fuse number 3 20amp under bonnet has blown.replace fuse drive 500 yards and blows again, Put 30 amp in and that blows aswell.
Anyone had this prob before l go to deep with it.
Any help please.
Thanks
Stu

 

[kevin p]

Hi Stu, do you know what circuit the fuse is protecting?
Kev.

 

[stu bag]

Hi Kev
The fuse protects the anti theft system and the fuel pump.
Bit hard to isolate one at a time.

 

[kevin p]

If you take the fuel cap off and get someone to turn the ignition key on, can you hear the fuel pump 'Whirr' for a few seconds?

 

[stu bag]

Thanks Kev
Fuel pump works because the car runs for a short time if you put
a new fuse in.
Sounds like a have a short but stuck on how to trace it as l can't isolate
the circuit.

Stu