7 replies to this topic

[croc7]

I’m planning to remove the mechanical fuel pump and replace it with the AUF214MS electric pump from mini spares. Probably source power from the dash mounted ignition switch through a separate toggle switch (anti-theft) then back to the subframe mounted pump. Will 16 AWG wiring do the job?

Edited by croc7, 26 September 2021 - 06:12 AM.

[nicklouse]

Easy. Could drop to 1mm

[timmy850]

Or alternatively chuck a relay in the boot and get power direct from the battery. Your trigger wire can come from the ignition switch

Saves all the current going all the way up the car

[Ethel]

If you use a normally closed relay you could use the oil pressure switch to cut the pump as a safety feature. If you had a crash, the engine would likely stall, killing the oil pressure.

[croc7]

Or alternatively chuck a relay in the boot and get power direct from the battery. Your trigger wire can come from the ignition switch

Saves all the current going all the way up the car

Thanks for the reply. My question is; wouldn’t the trigger wire have to run the length of the car from the ignition switch to the pump?

[timmy850]

Or alternatively chuck a relay in the boot and get power direct from the battery. Your trigger wire can come from the ignition switch

Saves all the current going all the way up the car

Thanks for the reply. My question is; wouldn’t the trigger wire have to run the length of the car from the ignition switch to the pump?

Yes, but the trigger wire runs very little current, only enough to turn on the relay. The high current wire can go from the battery to the relay and then to the pump

[Ethel]

It'll draw less than a brake light & there are 2 of those wired together. A relay in the boot could be an ignition source for spilt fuel - the risk's likely as negligible as the extra current draw.

[nicklouse]

 

 

Or alternatively chuck a relay in the boot and get power direct from the battery. Your trigger wire can come from the ignition switch

Saves all the current going all the way up the car

Thanks for the reply. My question is; wouldn’t the trigger wire have to run the length of the car from the ignition switch to the pump?

Yes, but the trigger wire runs very little current, only enough to turn on the relay. The high current wire can go from the battery to the relay and then to the pump

 

What high current wire? A pump will pull 3-5 amps only  the brake lights are just over 3 amps for the pair. Add side lights and you are getting up to 5 amps total.