Fuel pump rod tip

[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

[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.

[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...

Dale

[las]

Well I'm at it again and have been giving it some thought, maybe others could find my thoughts useful.

The surface on the drive is sloped so I opted to go for the pointier version as I thought the flatter version would still only have a small surface contact due to the slope of the drive. Problem solved until new evidence appears

The reason for giving this so much thought is my plan to make a dual mechanical fuel pump setup for my turbo build.