RA23 Electronic Fuel Pump location

[Jadman]

Yeah the pump is certainly mounted the right way.

I thought it might be fuel shortage, but when I lowered the front end off jack stands the vibration noise was significantly reduced which made me think there must be fuel in the pump.

Could it be that the tank is now empty and the pump can't push the fuel along as its now just sucking air?

[Omegaman]

these pumps are normally fed by gravity.
So if the pump is too high or too far from the tank outlet, it might not be able to suck it...lol

[Jadman]

So tonight i disconnected and removed the fuel tank, filled the jerry can and connected it to the inlet of the pump and turned the pump on. No fuel passed through despite all the vibration and racket.

This tells me that the pump is rooted, ill buy another one, whats the best to get? Do i need a specific pressure? Can i just buy one of those cylindrical ones or do i have to buy another one the same?

On another note, seems i have spark after my elec dizzy conversion which is great!

["Z" UTE]

Being a carby fed engine, you will only want a pump with a delivery pressure of a few LBS per hour. The cylinder ones you speak of are generally EFI main pumps or EFI pre pumps, both types supply pressure way above the requirements of a carby.

The other thing to bear in mind is that the EFI pumps are designed for continuous flow, and will not stop delivery just because your fuel bowl is full. The pressure on a needle and seat would be horrendous.

The alternative to the Electronic Pump (Ticky pump) is the Holly Blue .


cheers Chuck.

ps. I hate to labour this point, but the location of the pump on the chassis rail, would have provided a head of pressure or gravity feed to the pump. Placing the pump in the boot has significantly reduced this head of pressure/weight of fuel at the pump inlet.

[Jadman]

Thanks Z.

I take your point, and since still have the lines from the donor car, will now probably look to remount the pump on the chassis rail under the car. Problem for me is access, but ill figure it out.

Is it likely that the pump is rooted, or just cant deal with the lack of "head of pressure"??

Cheers

["Z" UTE]

You mentioned a change in pump tick rate a bit back, that was either fuel starting to feed through the pump, or some floaties have got into the pump.

Pay a visit to your local Vet and grab the biggest syringe that they can sell you. Use the syringe to prime the fuel lines from the tank to the pump and from the pump to the carby. Disconnect the fuel line at your carby and with bucket handy start the pump and see how you go.


cheers Chuck.