Steward Warner fuel pumps problem

[Rune]

My fuel pumps leak the fuel back, it is possible a no return valve not working, it is the same for both pumps. Does someone have a chematic drawing to share so I can see how they work ? I do not like to open the pumps without know what is inside. I belive it must be a kind of flapper valve there as check valve. Since I have original pumps,and they have been fully overhauled in UK. I hope to have them installed, if not there will be Facet pumps in the car.

 

[Doc Watson]

This might help...

 

[Rune]

Thanks Doc. The pumps deliver enough fuel, but when I start the pumps they run fast until pressure is up, then I tougth they should stop until there are need for fuel, but the pumps still run a little not much, so I do not know if there are need for dissmantling the pumps. I have a regulator that give the Webers 2.5 psi.

 

[Doc Watson]

I'm no expert but I thought that the pumps should run a little when pressure is reached. I also thought that 3 psi was the desired setting for the fuel pressure into Webers but might well depend on engine size etc. Someone with more experience will hopefully give their opinions.

 

[Rune]

Doc, when I run at 3 psi I oserved that one of the intake valves on the Weber was pressed open and it leaked, so at 2.5psi it was ok.

 

[Neil]

On my 250GTE, the fuel pressure was 2.5PSI and the fuel pump chattered away before starting the engine. As fuel pressure built up, the pumps slowed down to a slow tic-tic.

 

My SW pumps run at 3 psi and do continue running slowly once pressured up. No problems with them in 2 years/6500 miles of running.

 

[Charlie Farley]

Hello Rune,
The pumps run very fast, initially. Then they will click every 1 or 2 seconds to maintain pressure. That is all perfectly normal. I hope that helps ?

 

[Rune]

That helps, then I leave them as they are in perfect condition