|
|
|
Feb 27, 2013 22:40:31 GMT
|
|
Fishing for advice here...had problems starting the subaru brat which i have traced to the fuel pump. Its got 12v feed going to it but next to nothing amperage wise so no useful power there to work the pump. Debating if I should either run a relay to it (would be a bit untidy as wires would have to be routed from engine bay to the pump under the body) or install an additional pump somewhere under the bonnet - but where should the feed to it be coming from (to either the relay or the new pump)? If I wire it to the ignition or coil feeds I guess it carries on pumping petrol into the carb if engine stalls or heaven forbid, an accident leaves me unable to flick a rocker switch to cut power to the pump - so real fire hazard and possibly hydraulic lock in the bores when restarting? Tracing wiring is a nightmare - lots of stripping out and to date cant find the source of the feed to the pump or any relay to the pump in obvious easy to get to places - handbook doesnt give any useful wiring information for this problem and local scooby garages cant help with microfiche diagrams - seems they went out with the ark! Thanks...
|
| |
Opel Manta GTE
Subaru Brat
Vauxhall Centuar
London Taxi
Daily smoker Octavia VRS
|
|
squonk
Part of things
Posts: 858
|
|
Feb 27, 2013 23:11:55 GMT
|
|
If it has a 12v feed to it but is not drawing any current it is not the feed that is at fault (unless the 12v drops when the pump is connected). How is the pump earthed? To complete the circuit and allow current to be drawn there needs to be a good earth to the pump. Are you sure that the pump itself is not faulty
|
| |
2004 Chevrolet Avalanche Z71
2005 Mercedes CLK320 Cabriolet
1996 Mercedes C180 Elegance Auto Saloon
1996 Rover 620Ti (Dead fuel pump)
1992 Toyota HiLux Surf
1987 Range Rover Vogue (Rusty)
1992 Range Rover Vogue SE (More Rusty)
2006 Chrysler Grand Voyager
2008 Corsa 1.4 Design
|
|
|
|
|
Feb 28, 2013 11:17:43 GMT
|
|
Hi, as squonk says. Take a supply for the pump from the same place on the ign sw as the coil comes from, don't take a feed from a fused supply. Do you want to be stuck at the side of the road in the rain trying to find out why the heater, for example, has blown it's fuse so that you can get going again? If you are concerned about the event of an accident fit an inertia/impact switch, on the bulkhead, in the supply wire to the pump.
Colin
|
| |
|
|
marinacoupe
Part of things
Marina Coupe, Triumph Stag
Posts: 178 
|
|
Feb 28, 2013 11:50:24 GMT
|
|
I agree with squonk, assuming the pump is exposed to all the c**p that goes under the car, then it's likely to be the earth to the bodywork.
Easy check if the pump earths through the mounting bolts, get a jump lead and clamp it onto the fuel pump body, clamp the other end to a chassis member and then try starting again.
Rust is not a good conductor of electricity!
|
| |
|
|
|
|
|
Feb 28, 2013 18:43:01 GMT
|
|
Check the earth as has been mentioned.
Also check the pipe from tank to pump, make sure its not collapsed.
|
| |
|
|
