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Fuel pump rod tip

Posted: Mon Dec 04, 2017 8:16 am
by las
I'm in the process of turbo'ing my engine and have the fuel pump out, the pump rod in the engine have a sharp ball like tip and the other old one I have laying around have more of a cone and a flat tip.
The flat tip version are a few mm shorter.

I would think the flat tip would be better as it has a bigger surface and therefore distribute the load on a bigger surface!

What would you people think, or what do you know :-)

Re: Fuel pump rod tip

Posted: Sun Apr 15, 2018 1:36 pm
by proljoy
I believe there are two to three diferent push rod lenghs and fuel pumps to match. If you mix them up it will affect the fuel pressure.

Re: Fuel pump rod tip

Posted: Mon Apr 16, 2018 9:16 am
by Dale M.
Old school fuel pumps for "generator" engines used a 106mm length pushrod, newer engine with "alternators" use a shorter fuel pump and 100mm pushrod... New short rod fuel pumps also has actuation arm that comes down below the bolting flange...

(Image from J bugs site)

Cant mix and match with out problems...