What fuel pump?

[chimp007_uk]

Some of you might have read my wip about the troubles I've been having with fuel pumps.

I had an R1 fuel pump for running my bike carbs on my c20xe, it ran perfectly but the pump let go, and I'm now running a facet solid state 40106.

Spec:

4.5-7psi and 32 gallons/hour rated up to 150hp.

Whats peoples opinions or experience? It was missfiring at pod and felt sluggish.

Thanks,

Chris

[matt_vaughan]

Think you need to be running less than 4.5 psi mate but I'm not sure, it's kind of what i've been looking into.

IIRC Tom Reid's 1400/1200 (whatever it was) was running 3 psi. Dont know if thats relevant to your XE

[tom reid]

Chris, I've a redtop pump that will supply the engine with more than enough fuel, however, if the pump you have was not supplying enough fuel, i would have expected to see the afr go lean at the misfire area.
I could be wrong of course, you can have the pump to try.
Opinion?

[chimp007_uk]

I was busy all weekend and promised Linsey a car free weekend :(

Its running 3psi now, I'll take it out for a spin tomorrow evening when I get in from Javelin coaching and see how the afr is looking. The prob was last time, I had to set the fuelling at 4psi to get the afr's up as at 3 it was leanish. Missfire seams better though at 3psi.

I'm thinking it's a flow rate problem, I'll come back tomorrow with some figures :)

[MK999]

You also had to crank the pump up to get it to hold psi didn't you? I forget exactly what you did to get it to stop dropping at WOT lol

[chimp007_uk]

didn't need to crank to get pressure, its an electric pump. it dropped slightly under load but it was Runnin 4psi to get afr. will have a play tonight

[MK999]

Thought you adjusted something on the pump to get it to hold 4psi? Or did you turn down the regulator? :confused: