Gary A. Graham wrote:
>
> The fuel pump (SU type, but really AC) on my B won't stop pumping. It
> used to run a bit then taper off and stop when the ignition switch was
> "on". I removed the hose and plugged it to see if it was a stuck float--
> no change. I have no idea what to look for in the pump itself. Is there
> some sort of pressure sensor to switch the pump on and off internally?
> Does it matter if the pump runs continuously? I have read (I think) that
> "solid state" fuel pumps run all of the time . . . . do they?
>
> Thanks--
>
> Gary
> 74 mgb
The SU stops pumping when enough back pressure has built up from the
carbs. If it still runs when you plug the output then the inlet valve
must be leaking. There are two filters on the pump, trying cleaning
them and flushing out the pump. Continuous pumping would also be caused
by a punctured diaphragm, but then I would expect to get petrol, or at
least fumes, coming out of the vents in the boot.
PaulH.
|