Re: Electric fuel pump vs original mechanical fuel pump

Posted by HH56 On 2021/11/29 16:34:35

You didn't detail where the Airtex is located and I am not familiar with the Stromberg to know which screw you are removing. At only 4 psi the electric pump should not be any stronger than your mechanical pump. When you say gas is pouring out when a screw is removed, if the Airtex is installed so it is either pushing fuel thru the mechanical pump or even in parallel and used in place of the mechanical, the electric pump by itself should not be the cause of the issue. The electric pump will keep pumping and if fuel is draining out the bowl in the carb the pump will keep adding more in until it is turned off. Without the engine running a mechanical pump will only expel what fuel might be in the diaphragm chamber and able to be pushed out by the spring pushing on the diaphragm.

Could the screw be some kind of drain hole to clean old fuel out the bowl? If not how about a photo of the screw location and more details of the pump install.