Fuel Delivery

[Bigmorgs]

Mokesperts

My fuel filter is between my mechanical pump and carb.

My question is should it be full of fuel or just about full?

Mine is always 1/4 full?

Do I need a new pump or is this just the pump reaching the correct pressure?

Thanks!

[Terry]

Hi, 

The fuel will tend to drain back a bit when not running and depending on things like the angle, the brand etc. but I don't tend to see full or nearly full filters, 1/4 is probably okay. I would also move the filter to between the tank and the fuel pump as there is normally crud in the tank and there is a fine mesh filter in the pump that can block up over time. 

Terry

[Bigmorgs]

Thanks for the reply Terry will do this weekend!

What is the correct PSI or LPM for a 1275cc

[Halfpint]

Hi,
Mine run under half full in the fuel filters all the time, one is a mechanical pump feeding a HS4, and one is an electric pump feeding a HIF44.
I guess its right as it never starves for fuel.
The Facet electric pump delivers around 2.5 to 3 psi of pressure, not sure what the mechanical one does though.
Most 1275's would run between 8 to 11 ltrs per 100 ks , obviously they get a bit thirsty climbing hills. There are quite a few pumps out there, my Facet is quite noisy though, and Im trying to find ways to quieten it down a bit.

HP

[Terry]

Hi,

as Hp says the pump should be 3psi or under, but many on the shelf at auto stores are 3-5psi so they will work but flood the engine.

LPM depends on how heavy your foot is.

I have recently removed some facet pumps and fitted mechanical pumps because the owners complained about the noise.
Terry

[Bigmorgs]

Thanks guys really appreciate the advice