fuel pump fuse

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peter freeman
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fuel pump fuse

Post by peter freeman » Sun Sep 15, 2019 6:55 pm

I have a intermittant fault in that the fuel pump sometimes does not run. I am fairly sure it is a relay base fault as taking the two relays out and putting them back in gets the pump running again. I will take the bases out and have a look at them when time permits but at rhe same time would like to feed the pump via switch in case the pump stops again at a inconvenient time - to do this I would like to modify the circuit at the fuse but don't know where its hidden - anyone know ?



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Post by AJL Electronics » Mon Sep 16, 2019 8:56 am

I THINK it is the supplementary fuse box on the firewall of the passenger footwell. There are four blade fusesin there.


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Post by peter freeman » Mon Sep 16, 2019 12:36 pm

There are a few - like the central locking but I could see none with the wire colouring of the pump fuse. The cable from the relays are also taped up so you cannot easily follow them. Obvoiusly a job for when I have the time to spare. Thanks for the thought though.



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Post by gtcse8 » Mon Sep 16, 2019 1:25 pm

Peter have a look in the rear passenger side cubby box for the fuel pump cuttout switch.
On Wills it kept cutting out on me till I moved it and shoved it to one side.
It may be wet, OR not liking the way its laid?.

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fuel pump fuse

Post by peter freeman » Mon Sep 16, 2019 3:27 pm

Removing the relay put it to rights so I don't think its the cut out. I could connect the cut out the the rear window supply and run the pump with the rear window switch if stranded though



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Post by simmit » Mon Sep 16, 2019 10:49 pm

peter freeman wrote:
Sun Sep 15, 2019 6:55 pm
I have a intermittant fault in that the fuel pump sometimes does not run. I am fairly sure it is a relay base fault as taking the two relays out and putting them back in gets the pump running again. I will take the bases out and have a look at them when time permits but at rhe same time would like to feed the pump via switch in case the pump stops again at a inconvenient time - to do this I would like to modify the circuit at the fuse but don't know where its hidden - anyone know ?
Hi Peter.
My view, for what it's worth (I'm no electrician), is that adding more complexity to the circuit may well be OK for now but in the long run it may be a complication that brings problems of it's own. Are you going to be mending something that's not broken? I'd say if the problem is in the relay/ connections then fix it at source. With respect ... KISS!
Just an opinion.
As to position of fuel pump fuse ......... sorry but can't help. I have position of most fuses and relays located but not that one. If you find it please let me/ us know.



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Post by peter freeman » Tue Sep 17, 2019 9:25 am

I thought I would put a luminated switch on the fuse so that I can see when there is power to the fuse and if it fails then use the switch to apply power. Not difficult to do and the quickest way to get the pump running again. It would help to see where the loss of power is as well - before or after the trip.



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Post by DARK STAR » Wed Sep 18, 2019 8:55 pm

Funny you should say that ...

Today when I switched on there was no priming 'click' from the relay and the car wouldn't start even when I hot-wired the pump.
Concluding therefore that the relay was at fault I gave it a thump and everything sprang to life.
As far as fuses are concerned mine seems to have two, both are in / on the relay, but mine is originally Ford, not Middlebridge so this may not be much help.

I then have a question of my own :
Did the relay stick simply because it isn't activated often enough, or is it on its way out and should be replaced ?
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Post by Old and Slow » Wed Sep 18, 2019 9:34 pm

Could be either, no way of knowing.
Carry a spare, just in case?


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Post by philhoward » Wed Sep 18, 2019 9:41 pm

Judging by the state of those blue crimps, it could be anything..


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Post by peter freeman » Wed Sep 18, 2019 11:00 pm

Relays are now very cheap and most come from china - sorry to say you get what you pay for



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Post by peter freeman » Mon Sep 23, 2019 4:04 pm

Fuse and problem found.
The fuse is behind the two relays only can be seen with the relay block removed - in my car anyway - photo shows. The fitted fuse was 20A which seems to be a bit big for the in line fuse holder and the end getting hot has part melted the holder and the connection was not good. I only had a knife fuse holder in the garage so that has been fitted with a 20A fuse which seems a bit over the top to me for a fuel pump but that's what was fitted. Hopefully the fuse holder was causing my intermittent pump - seems a good bet.
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Post by AJL Electronics » Mon Sep 23, 2019 4:16 pm

That spare slot is for a Ford fuseholder which takes a blade fuse. When I get my project back in the workshop, I can send you a photo of one.


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Post by philhoward » Mon Sep 23, 2019 4:19 pm

The chocolate block doesn’t look “factory”?


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Post by AJL Electronics » Mon Sep 23, 2019 4:24 pm

philhoward wrote:
Mon Sep 23, 2019 4:19 pm
The chocolate block doesn’t look “factory”?
That is where the Ford fuse holder has been cut from. No idea why as the Ford item is a nice quality jobbie.


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