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49r · 04-09-2014, 02:27 AM

[QUOTE=Old Henry;855648]The carter pump will not let the mechanical pump pull through it when the electric pump is off.

On my 8BA F1 the mechanical pump did pull fuel through the Carter pump (turned off), but only up to a speed of about 35 mph. After that the restriction inherent in the the Carter pump would not allow enough fuel to be supplied. This is why I had to install a bi-pass valve. I only use the electric pump to prime the carburettor - required if my pickup has not run for more than 3 days.

04-09-2014, 02:27 AM	#40
49r Senior Member Join Date: Jul 2011 Location: Wellington New Zealand Posts: 309	Re: Airtex fuel pumps [QUOTE=Old Henry;855648]The carter pump will not let the mechanical pump pull through it when the electric pump is off. On my 8BA F1 the mechanical pump did pull fuel through the Carter pump (turned off), but only up to a speed of about 35 mph. After that the restriction inherent in the the Carter pump would not allow enough fuel to be supplied. This is why I had to install a bi-pass valve. I only use the electric pump to prime the carburettor - required if my pickup has not run for more than 3 days.