Modifying 280z fuel pump for carb use?

[240260280z]

Trying to find a low pressure quiet reliable fuel pump for a 240z resto however; not much out there that is quiet.

I was thinking that maybe lowering the pressure of a 280z FI pump may be do-able:

- remove some of the cylinders in the impeller to reduce flow (item 2 below)

- lower relief valve pressure (item 3 below)

These mods and a good low pressure FPR up by the carb may be suitable, reliable and quiet. Any input before Count Dracula and I go down to the lab...Fun Time.

Edited July 17, 2011 by Blue

[doradox]

You could put a large return line at the carbs with a low pressure regulator just past the carbs. In other words bypass most of the volume from the pump back to the tank to lower the pressure.

Steve

[Z train]

Tinker with the pump and you might as well toss it in the garbage.Just reg it at the carb(s).That pump will keep the fuel supply on the cool side.

[ozconnection]

Tinker with the pump and you might as well toss it in the garbage.Just reg it at the carb(s).That pump will keep the fuel supply on the cool side.

:tapemouth Do not destroy an EFI pump by trying to modify it. I agree with Z train.

I ran an efi pump with a carb once, and like Doradox, I ran a return line back to the tank, in fact it was already there and it was a 1/4 inch line. I ran a Holley carburetor and the resulting pressure didn't flood the carb. The ONLY mod I made was to cut off the restriction at the end of the return fuel line rail, so there was no restriction in the return line that would, for a low pressure pump, provide the carb with the needed 4-4.5 psi fuel pressure.

Cheers mate.

[FastWoman]

Is that a working OEM pump you're about to mod? :tapemouth

Why not use the pump of some common, more modern EFI car? Maybe a Chevy Cobalt. Sell your working pump on Ebay to someone with a 280, if you don't want/need it. Do it for karma's sake! :classic: