David Jenkins
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| posted on 26/11/07 at 10:36 AM |
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Fuel cut-off thingy
A quick question - I'm shortly going to be fitting an electric fuel pump to my locost, and it seems like a good idea to fit a gizmo
that'll cut the power to the pump in case of an accident.
Can anyone recommend a suitable donor for one of these? Ideally from a commonly-available vehicle, and easily accessible so the moron from the
scrapyard won't throw a sulk. 
Presumably it should be mounted securely onto the chassis - I was thinking about putting it just in front of the scuttle. Does this sound right?
cheers,
David
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GeoffT
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| posted on 26/11/07 at 10:48 AM |
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Usually a few of these on ebay, like this :-
Inertia switch
......might save the unpleasant scrapyard visit 
Edited to say that mine is simply mounted on the scuttle panel. Fortunately haven't tested it in anger yet, but I'm sure it's solid
enough to trip in any significant 'bump'
[Edited on 26/11/07 by GeoffT]
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JAG
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| posted on 26/11/07 at 11:31 AM |
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...or you can get the same switch out of a Rover 214/216. It's fitted inside the centre console just below the radio on the drivers side.
Remember to pull the loom through and cut it off about 12" from the plug and you've got everything you need.
I mounted mine to the scuttle, on the engine side. It's nice and easy to get at if you need to reset it.
My cars done almost 7000 miles and I've never had to touch it. And 'yes' it does work, I have tested it but had no trouble with it.
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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David Jenkins
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| posted on 26/11/07 at 12:29 PM |
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Two good suggestions - many thanks! 
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saigonij
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| posted on 26/11/07 at 01:28 PM |
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i got mine on ebay ( item number 270154862031 ).
goes the job. think i mounted mine upside down ( not that i think it matters ) behind the dash - easy to reset.
if its wrong, ill put it button side up, but i think its ok...
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NS Dev
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| posted on 26/11/07 at 01:28 PM |
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Ford sierra injection, in boot under spare wheel.
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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02GF74
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| posted on 26/11/07 at 02:25 PM |
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a locost one would be to wire the pump up to the alternator output - obviously you would have to ensure any accidents end up with the eninge not
running
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martyn_16v
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| posted on 26/11/07 at 03:36 PM |
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If you wired it up to the alternator output it'd probably never start after being left off overnight, the fuel pump needs to prime the fuel
system before/during cranking. And you'd need to be able to isolate the alt output from the battery when the engine stops, which is going to be
a bit more difficult than just fitting an inertia switch I reckon.
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hector
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| posted on 26/11/07 at 04:44 PM |
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I went to me local scrappy and got a mondeo one for 2 quid-Ideal
Wired into pump relay, job done!
Mondeo ones are located in pass footwell on l/h side easy to get at
cheers colin
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John Bonnett
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| posted on 26/11/07 at 06:32 PM |
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The problem with buying a Ford switch on its own is that you then need the mating electrical plug to go with it. The spacing of the three connectors
is too close for Lucars. This was what I did. I then went to our local scrapyard and found one on a Fiesta located behind the upholstery in the n/s
footwell. I bought another switch with the plug and wires for a couple of pounds.
Anybody want a switch on its own??
Mine is mounted on the scuttle through a relay.
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NS Dev
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| posted on 26/11/07 at 08:22 PM |
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John's dead right, but on the sierra you just cut the plug off with the switch, problem solved!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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GeoffT
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| posted on 5/12/07 at 10:20 AM |
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Not sure if you've found one yet, but I'm using one of these :-
Link
.......works fine and has given no problems so far.
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thomas4age
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| posted on 5/12/07 at 06:51 PM |
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I have it wired via an oil presure switch,
the pump goes live in two situations, cranking via the starter relais and via the oil presure switch, in all other cases the pump stops.
you could serie that with a sierra inertia switch to be dead sure nothing goes wrong,
I like the fuel cut option when out of oil presure, it saved me the old 16v engine 2 times.
grtz Thomas
If Lucas made guns, Wars wouldn't start either.
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David Jenkins
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| posted on 11/1/08 at 04:28 PM |
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A thought - is a relay necessary with these cut-offs?
Just that I could fit one easily if it's wired in direct, but adding a relay would be a PITA - obviously not impossible, but a real pain.
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GeoffT
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| posted on 11/1/08 at 05:15 PM |
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Hmm....you've got me slightly worried now. My cutoff IS wired directly in series with the fuel pump, and I've had one or two instances of
the pump being reluctant to fire up at switch on. I'd forgotten this little device was in the circuit, so your post may have pointed me in the
right direction.......
All of which is of no help to you at all really....
Geoff.
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NS Dev
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| posted on 12/1/08 at 10:19 PM |
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dunno about the rover switch but the one in the sierra boot is direct switching, no relay.
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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David Jenkins
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| posted on 13/1/08 at 09:36 AM |
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Excellent - looks like I need a Sierra switch then - are the more modern Fords the same? Sierras are getting like hen's teeth these days...
cheers,
David
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britishtrident
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| posted on 13/1/08 at 10:04 AM |
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quote:
Originally posted by NS Dev
dunno about the rover switch but the one in the sierra boot is direct switching, no relay.
On most injection cars they are wired through the main relay so they kill the spark as well.
All the Rover ones are fitted where Jag described --- I assume RHD Hondas are the same.
Jag ones are fitted in the boot similar to the Sierra.
Freelander ones are in the engine bay on the scuttle.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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David Jenkins
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| posted on 13/1/08 at 11:07 AM |
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quote:
Originally posted by britishtrident
On most injection cars they are wired through the main relay so they kill the spark as well.
Stop it!
Every time I think of ways of setting up this switch, somebody thinks of a good idea that changes everything!
Only joking... but that does seem like an excellent idea - it would be very easy for me to cut the feed to the Megajolt, EDIS and coil as they have a
common 12v supply.
Looks like a relay is a sound idea - I'll just have to grin and put up with the extra effort it will require (I would want to put the relay in
the spare socket on my combined fuse and relay box - I don't want yet another relay screwed to the firewall!)
cheers,
David
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