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SU Fuel pump problem

Posted: Sat Jun 12, 2010 2:35 pm
by wells01
Hi
This is a strange one. The fuel pump on my 63 saloon ticks away until it has primed itself and then stops! It pumps the occasional splutter of fuel. If you disconnect the feed from the tank it starts ticking again.
I have blown out the fuel lines to check they are clear and stripped and rebuilt the pump.
There is plenty of fuel in the tank.
Any ideas?

Re: SU Fuel pump problem

Posted: Sat Jun 12, 2010 3:01 pm
by bmcecosse
It's working as it should - what's the problem ?

Re: SU Fuel pump problem

Posted: Sat Jun 12, 2010 3:17 pm
by wells01
bmcecosse wrote:It's working as it should - what's the problem ?
Thanks for your reply. Its not working as it should.
If you remove the fuel pump outlet pipe it still doesnt pump as it should when it has no resistance. It should pump like mad when disconnected from the carb. Sorry i didnt make that clear in my first post.
I realize it would stop once the float bowl was full but it stops pumping once it has drawn fuel up as far as itself!
Many thanks

Re: SU Fuel pump problem

Posted: Sat Jun 12, 2010 3:53 pm
by mikeysmorris
take off the petrol cap and try it again cap could be blocked, cheers Mikey.

Re: SU Fuel pump problem

Posted: Sat Jun 12, 2010 4:33 pm
by wells01
mikeysmorris wrote:take off the petrol cap and try it again cap could be blocked, cheers Mikey.
Thanks
Tried your suggestion. Sadly no change.
Regards

Re: SU Fuel pump problem

Posted: Sat Jun 12, 2010 4:55 pm
by PSL184
Did you clean the filter when you rebuilt the pump?

Re: SU Fuel pump problem

Posted: Sat Jun 12, 2010 5:34 pm
by Alec
Hello Wells,

could you have replaced the discharge check valve upside down?

Alec

Re: SU Fuel pump problem

Posted: Sat Jun 12, 2010 5:41 pm
by wells01
Alec wrote:Hello Wells,

could you have replaced the discharge check valve upside down?

Alec
H Alec
Its started working. I wonder if it was an air lock.
Many thanks

Re: SU Fuel pump problem

Posted: Sun Jun 13, 2010 12:26 am
by bmcecosse
Sorry - I misinterpreted your first post.......... If it had an air lock (highly unlikely!) it would have ticked away like mad all the time ! The only thing that will stop it ticking (apart from faulty points etc) is pressure on the discharge side.