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fuel pump update
Posted: Thu Jan 05, 2006 11:42 am
by phil63
is priming the answer? . I fitted a short lengh of pipe to in inlet side of the pump to a small tin of fuel and lo and behold it worked ok , I refitted the original pipe and it still works ok !! . I don't have any other answer . Is it just one of those things!!
Regards Phil
Posted: Thu Jan 05, 2006 3:35 pm
by Stig
Don't know what your problem was, but the SU pump doesn't need priming -unlike some high pressure pumps for fuel injection. It should chatter away pumping air until the fuel finds its way into the pump. Having said that I don't know what height it'll pull fuel in from, I think the only spec is the output pressure. Maybe it'll manage sucking air and then fuel from the tank to the carb but not from a can on the floor up to a garage bench?
Posted: Thu Jan 05, 2006 8:21 pm
by bmcecosse
Well (!) - no pump will suck more than 1 atmosphere = ~33 ft for water !! But it will only suck if the valves are ok - if they are dry and perhaps a little bit of dirt in there - the priming with fuel may just have lubricated/cleaned them enough.
pump
Posted: Thu Jan 05, 2006 8:24 pm
by Willie
The manual says that the Minor pump should be mounted three feet higher
than the tank when testing if that helps.
Posted: Fri Jan 06, 2006 1:01 pm
by phil63
Maybe it's the valves , I have never delved in there . I will dismantle a spare pump and see that they look like !!
Thanks , regards Phil Burley
Posted: Fri Jan 06, 2006 3:14 pm
by Stig
The valves certainly can fail. My car was fitted with an after-market electronic pump when I got it and I had to replace it due to a split in one of the valve diaphragms. Maybe with an SU pump you can get spares for the valves?
Posted: Fri Jan 06, 2006 8:15 pm
by bmcecosse
Never known them to fail - but they can get crud in them.