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SE6A Fuel Pump

Posted: Sat Jun 23, 2018 9:32 pm
by scimjim
Only the earlier 40s have a gauge filter at the inlet. Did you check for fuel flow as soon as the engine cut out? It sounds like a gummed up carb to me?

SE6A Fuel Pump

Posted: Sat Jun 23, 2018 9:37 pm
by bambam40
That's what I thought but have stripped it and cleaned all chambers and blown the jets thru. The result is exactly the same.

SE6A Fuel Pump

Posted: Sat Jun 23, 2018 9:38 pm
by Johniewalshe
If you have a gauze filter it will be at the Inlet to the carb. You will see a 19mm brass hex head plug under the inlet pipe to the carb.

SE6A Fuel Pump

Posted: Sat Jun 23, 2018 9:39 pm
by scimjim
Johniewalshe wrote:
Sat Jun 23, 2018 9:38 pm
If you have a gauze filter it will be at the Inlet to the carb. You will see a 19mm brass hex head plug under the inlet pipe to the carb.
That’s on a 40, not a 38DGAS.

SE6A Fuel Pump

Posted: Sat Jun 23, 2018 9:40 pm
by scimjim
bambam40 wrote:
Sat Jun 23, 2018 9:37 pm
That's what I thought but have stripped it and cleaned all chambers and blown the jets thru. The result is exactly the same.
Have you got fuel flow when the engine stops?

SE6A Fuel Pump

Posted: Sat Jun 23, 2018 9:41 pm
by Johniewalshe
If you put a fuel pressure gauge on right before the carb you will be able to see if you have the correct fuel flow/pressure when it cuts out. That will rule that out.

Also did you check the float height and condition on the float valve, not sure the correct term for it!

SE6A Fuel Pump

Posted: Sat Jun 23, 2018 9:57 pm
by bambam40
I will check these things tomorrow, thanks.

SE6A Fuel Pump

Posted: Sun Jun 24, 2018 8:15 pm
by Oldconn
This is not meant to sound silly, but.......your new pump could be delivering too much pressure, overcoming the carb float needle, and flooding the engine. Does it smell of petrol immediately after stopping? Even though your filter is only half full(so is mine most of the time) , a regulator in the system is a good idea. I can't see in your post what sort of pump you have. A Facet Red Top will deliver too much pressure for the DG38, which only wants about 4lbs. The Silver Top is more suitable. I have a Red Top, with a pressure regulator set at about half of maximum, it works fine.