Small Fuel Pump Wiring Woe (SFPWW)

[SeventyNine]

quick one, just had a play with my ECU diagnostic software before i mess about with getting it running.

good news everything works fine, tested the injectors, coil etc all hunky dorey. I'm pretty glad i didn't get sold a £300 piece of wiring loom all those years back ;D

small issue being that the fuel pump feed for the relay didn't work, i did notice that the cable had been cut short when i bought it but didn't think nonetheless of it.

so instead of crying about it, i think i'll just run it off something else instead.

i was thinking, if i had it running from off an ignition live, via a hidden cutout switch and fit one of those impact sensors so it cuts out, that gives me extra security

sound about right?

[popuptoaster]

i dunno about that, if i stall my engine the fuel pump cuts out even if the ignition is still on. if your fuel system is designed for the same set up I'm not sure how happy it would be about that, i guess in theory it would just pump the fuel back to the tank around the circuit, i'd still attempt to get it running off the ecu though i think rather than just give up straight away, could just be a dodgy connetcion.

[SeventyNine]

i'll have a go at trying to get a feed from the ECU, i'll go as far back as the connector on the actual ECU itself........

I'm sure most rally cars n stuff have them running in a similar way? you always see them turning on fuel pumps before stages etc......

[dave21478]

If you cant get it to work through the ecu and need it to switch off if the engine cuts, then wire it via a relay through the oil pressure warning switch. Stalling the engine will cut the fuel pump after a second or so.

[SeventyNine]

yeah, thats what i was thinking, either that or the crank sensor.....but surely that means it takes longer to start the car right?