Fuel pump fuse goes pop! why?

[Chappy]

This is the third time my VY2 Clubby has blows the fuel pump fuse with is 15amp so I am wondering if anyone else has come a pond this issue and if so what caused it and what was the fix.

I have stepped the fuse up to 25am so hopefully this will fix this annoying issue, I am a little concerned that 25am may be a little large so again I am open for advice on this.


Cheers
Ken.

[Devil CV8]

After the second fuse blows the usual course of action is to visit an auto sparky or mechanic to find out why.

Although if the 25amp fuse blows, why not change it for a nail. won't blow a fuse then.

[Chappy]

After the second fuse blows the usual course of action is to visit an auto sparky or mechanic to find out why.

Although if the 25amp fuse blows, why not change it for a nail. won't blow a fuse then.


Ok well many thanks for this valuable advice! :eyes:

The mechanic said that this is not uncommon for the fuel pump fuse to blow and an auto elec didn't find any problems.

What I maybe should have included in the first post was this info sorry about that.

The 2 fuses have blown over a 2 month period and this is my third fuse the 25am I have fitted.

I was just curious if other have come across this problem that's all and though they may have found some funny thing that might cause it, both this the fuse has blown is when the car was idling for a good 10 to 15 minutes.

Ken.

[Peter B - CV8]

Fuel pump might be on its way out - or getting momentarily jammed with grit etc.

[Hammer]

yeah on its way out pulling to much current :)

[mike48105]

Had a vehicle about 10 years ago (not a Commodore) that used to intermitently blow fuel pump fuses.

Took 5 months to sort out. Huge frustration!!!!!!!!

Dealers and auto electricians could not find a problem.

Turned out wiring loom had been run between a plastic fastener and the fuel tank.

On hot days with less than half a tank of fuel the tank would expand slightly and trap the loom.

Over time rubbed away the wrapping and then the insulation and would then intermittently short out when the tank expanded.

Not necessarily your problem but worth looking for something similar

Cheers

[redvxr8clubby]

I can understand changing to 25 amp if you think maybe it's just blowing the 15Amp by a small amount over 15 Amps, however you do need to be careful doing this. It is quite likely that if a 15 Amp fuse is the correct rating that the wiring from the fuse will be rated accordingly. If you do get anything like 25 Amps being drawn for more than a short time you could wind up with the wiring getting hot and potentially even a fire hazard. If the fuel pump is the only thing on that circuit, at risk of stating the obvious you have a fuel pump problem or as someone already said a wiring issue. Just thinking about the comment that car was idling for 15 minutes when it last blew - could it be some sort of regulator or return line problem. Perhaps pressure builds up with low fuel demand and load on pump increases. Just a thought maybe others might comment on that possibility. Most obvious would be intermittent pump or wiring problem.

[LS1-5.7]

lol still laffin at devil's response but seriously now, it sounds like the fuel pump is straining and drawing too much current. Maybe it has crap in it or has fulfilled it's life ... I'd be getting it sorted as upping your safety margin is only masking a more serious problem. Are you running with less than a 1/4 tank alot ? If so the pump might be getting too hot and overloading. The fuel has cooling properties as well.

[Devil CV8]

good to see you took my answer in the way it was meant.


seriously,
going on the answers above I'd suggest a new fuel pump.

[RACCIRACOON]

Had the same problem a few years back with my VT Clubby. eventually the fuel pump caught fire and the car was off the road for about a month. new fuel pump definately a good idea.

[clubbie]

yeah on its way out pulling to much current :)

^^^^^^ What he said.......assuming all the wiring is OK, which you said had been checked by a sparky anyways.

Change the pump, breathe easy and put your mind at ease.

[cashie]

Replace the fuel pump if the auto electrician has proven the wiring to be correct.
Do NOT leave the 25A fuse in there, if you are, get a fire extinguisher on standby.