Fuel Pump

conerry · Post by **conerry** » Mon Aug 14, 2006 2:10 am

I have a 1953 4AD that does not run. It appears that the fuel pump (electric) does not work. Any idea how to test or rebuild or get a replacement?
Any suggestions welcome!

Post by **mikeyr** » Mon Aug 14, 2006 4:47 am

Rebuild kits are available from any British car parts source (Moss, British Victoria, etc.) Also, new pumps are standard pumps, MG's used 2 pumps, a high pressure pump and low pressure, Singer only used LOW pressure pumps so if you buy a new pump make sure it is a low pressure pump. I do not believe the rebuild kits make a difference, I think it is only one kit.

Mark Thompson · Post by **Mark Thompson** » Mon Aug 14, 2006 11:21 am

What is the correct fuel pump pressure?

Mark

Post by **mikeyr** » Mon Aug 14, 2006 9:03 pm

Page 4 of this PDF states 3/4 to 1lb. which is quite low, many cars used the exact same fuel pump as the 4AD. For me, I switched to a electronic fuel pump near the gas tank and put a pressure regulator on. I find that much more reliable than the fuel pump on the firewall, I did leave that pump there for cosmetics however.[/url]

Mark Thompson · Post by **Mark Thompson** » Tue Aug 15, 2006 11:28 am

Mike, I have a similar plumbing arrangement to you, with a second fuel pump in the rear, pushing instead of sucking. I also have a slight leak at the side of the carburetor where the throttle shaft goes into the carburetor. My pressure runs 2-3 psi. That is why I asked the question about what is suitable fuel pump pressure?

Mark

Bil · Post by **Bil** » Tue Aug 15, 2006 7:15 pm

Although I wouldn't want to take a stand on whether it was better to have a fuel pump as a Pusher or a Sucker (hey....wasn't that a '70's movie?), I have one of the new generation electronic SU pumps mounted in the engine compartment, operating as a Sucker of course. Actually, I have it installed on the right side of the engine just slightly lower than the original mechanical 4A pump. I figured this would keep the pump and gas tank in the same relative plane and only have to move gas upwardly from one side of the engine to the other. It is rated at 1.5 psi and so far it seems to be supplying fuel adequately to my Solex carb.
Note lesson learned the hard way: Follow the SU pump instructions and always mount the outlet pipe of the pump UP if they call for that.

Bil
'51 4A

Mark Thompson · Post by **Mark Thompson** » Tue Aug 15, 2006 8:48 pm

Thanks Bil,
The Sucker vs. Pusher issue relates to a vapor locking problem that sometimes occurs down here in Southern climates that is aggravated by the fuel line running parallel to the exhaust system. You Yankees probably don't have this problem.

Best Regards,
Mark