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Special Sports fuel issue

Posts: 123
Joined: Fri Feb 26, 2016 10:31 pm
Location: Bakewell

Re: Special Sports fuel issue

Post by migray » Wed Feb 06, 2019 9:50 am

Have you tried blowing down the fuel line from the pump to the tank? Sometimes crud can form in the tank across the pipe and stop it flowing, or a build up in the pipe somewhere.


Posts: 341
Joined: Mon Feb 15, 2016 8:41 pm
Location: South Essex

Re: Special Sports fuel issue

Post by NickDeAth » Wed Feb 06, 2019 8:50 pm

At college we were taught that if the pump has been put together properly if you operate the lever you should get a sort of "quacking" noise ( with no fuel in it). I remember it well!

"Nick - do you think you will ever put that old car back together again?"

Crossley Stephenson
Posts: 232
Joined: Wed Feb 10, 2016 9:15 pm
Location: Victoria, Australia

Re: Special Sports fuel issue

Post by Crossley Stephenson » Wed Feb 06, 2019 8:52 pm

Thanks Mike, I have blown the pipes through - pump to tank- no problem there.

Crossley Stephenson
Posts: 232
Joined: Wed Feb 10, 2016 9:15 pm
Location: Victoria, Australia

Re: Special Sports fuel issue

Post by Crossley Stephenson » Wed Feb 20, 2019 10:21 pm

For the sake of completeness and to finish this topic....

A new fuel pump repair kit arrived yesterday from David/Matthew Beales, fitted and pump reinstalled in about and hour, we now have fuel pumping to carburettors and the car starts.

I have examined the old diaphragm and old valves (again) but can see nothing obvious... but there was air being drawn in somewhere.

All good now, thanks for everyone's advice and assistance. I'm off for a drive around the Mornington Peninsula this arvo.


Db n j
Posts: 244
Joined: Sun Mar 13, 2016 8:55 am

Re: Special Sports fuel issue

Post by Db n j » Thu Feb 21, 2019 7:08 am


Congrats !

Thanks for letting us know.

Beat Weibel
Posts: 134
Joined: Sat Feb 27, 2016 4:13 pm
Location: Munich

Re: Special Sports fuel issue

Post by Beat Weibel » Sat Mar 09, 2019 4:59 pm

I had a similar problem with my Conquest New DHC that I hope to have resolved today:
The car stopped after a few hundred meters. Waiting and manually priming the pump helped to go for another 100 meters.
I dismantled the pump and fitted the refurbishment kit. Thereby installing the membrane at the same angle as it originally was. Unfortunately, the refurbished pump didn't pump enough fuel and all of sudden a click was heard and the pump didn't supply any fuel at all. So I dismantled the pump again and figured out that the membrane was not engaged properly. It was only turned by approx 45 to 60 degrees and also jumped out when I opened the pump. By pushing down and turning the membrane lever by 90 degrees it properly engaged and seems to work now.
Obviously the previous owner had not properly engaged the membrane. The car ran for many kilometers but maybe at some stage, the membare just became loose and the above mentioned problems began.
Two pictures attached: new orange membrane and old version with black membrane.

Best regards

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