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[Duke01]

Hello. Engine cranks, no codes, pump fuse blowing, relays swapped and still blowing. Car has been fine untill now, it has to be the fuel pump i presume? Thought this was very rare.... thinking about it the fuel gauge packed up two days ago aswell.... ? Help

[05omegav6]

Yup, change the pump and all should be well

[Marks DTM Calib]

No, fault find it properly first! 

In the boot, remove the cover plate so you can see the fuel pump top and connections, check that the wires are still attached and not shorting out. If all looks ok, then detach the wires and see if the fuse blowing stops.

Do this BEFORE going near the pump (as the fuel pumps are pretty trouble free and its normalty a wiring issue)

[Duke01]

Ok, removed plate and unplugged wires, fuse now blows when i put ignition on. before it only blew when i cranked it... 

[05omegav6]

Only suggested, as although uncommon, I know of a car locally that would blow that fuse regularly... swapping the pump, has to the best of my knowledge sorted it

[Marks DTM Calib]

Ok, so that tells you that the fault is in the wiring, I would expect it to be close to the fuel pump connection, does it still blow with the relay removed?

[Marks DTM Calib]

Only suggested, as although uncommon, I know of a car locally that would blow that fuse regularly... swapping the pump, has to the best of my knowledge sorted it

You know me Al, test and fault find to pin point and prove rather than straight in and change a part (as per the average garage sadly - Note, no offence ment) 

[amba]

Mine would occasionaly blow the fuse as the pump was getting lazy.Could be cured by thumping the underside of the fuel tank but eventually decided to replace pump and no further issues.

OP seems to having a wiring issue as with pump taken out the equation fuse still blows.

[Duke01]

I must admit i suspect the pump, stealers want £177 tho so wont be having a gen item.
If the relay is pulled the fuse doesnt blow...

[Marks DTM Calib]

I must admit i suspect the pump, stealers want £177 tho so wont be having a gen item.
If the relay is pulled the fuse doesnt blow...

By disconnecting the wires, the pump is no longer in the circuit so its not that.

[philhoward]

My money is on the loom to the pump then - I've no idea of the path though but expect it's chafed through/got pinched somewhere?  Any recent work in that area?  or anywhere for that matter?

[05omegav6]

Only suggested, as although uncommon, I know of a car locally that would blow that fuse regularly... swapping the pump, has to the best of my knowledge sorted it

You know me Al, test and fault find to pin point and prove rather than straight in and change a part (as per the average garage sadly - Note, no offence ment) 

None taken (it wasn't me btw)

I know your fault diagnostics know no bounds You were the one who determined that the only oddity present with my persistant cylinder 6 misfire was a 20kv discrepancy iirc

[05omegav6]

That only leaves the purple relays or the loom...

Carefully removing the cover from the relay will confirm whether there's an issue within. Either evidence of heat or pitting of the contacts

Most likely place for the loom to chafe is between the pump and where it reenters the car. Certainly on an estate that would be against the rear chassis leg... not sure about saloons as the loom takes a different route

[Duke01]

Thats a point actually, gave her new shocks and springs last week and that may explain the fuel gauge packing up... gonna go and crawl under now...

[philhoward]

Possibly caught the loom with an axle stand/jack?