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So my newly acquired Paso which had been in hibernation for a few years was treated to a new starter motor, new timing belts, oil change and some re-wiring as well as completely new fuel pipes all round.

I pressed the button and it started virtually straight away and sounds great. I haven't taken it out yet as I have an oil pressure switch to replace before I am completely confident that it is all OK.

However, and there is always a however, I have noticed that the fuel pump seems to be working all the time. It does cut out or become less noticeable if I turn the fuel tap off but otherwise it is ticking away constantly. The bike has the Weber carb and it still has the restricting jet in the "Y" piece.

Is this normal ?

yes, it is. The pump runs as soon as you turn the ignition switch on. Do not let the fuel pump run and close the fuel petcock as the pump will run dry which could damage it.

G.

The Paso, and the Sport, were built in the odd time that fuel pumps started to be used, and fuel petcocks were still in vogue. Its a bit redundant that our bikes have both. No real need for the petcock with a fuel pump. I replace my fuel petcock with a banjo bolt taken from a Weber. And Yes, the fuel pump runs all the time.

On the other hand, I have never quite figured out what the jet in the return line is supposed to do. If anything, it should be in the feed line to help keep the pressure down. But since I don't have a weber, I can't say what the ideal is.

Cheers,

ducinthebay wrote:...On the other hand, I have never quite figured out what the jet in the return line is supposed to do. If anything, it should be in the feed line to help keep the pressure down. But since I don't have a weber, I can't say what the ideal is.Cheers,

This is my understanding of the effect of those jets: