Re: Fuel bowl draining …

Posted by HH56 On 2021/9/13 20:48:32
Cannot answer if the fuel type will make a difference. Here in Calif we have had various additives required by the air resources board in their efforts trying to cut air pollution for so long I doubt very many remember pure petroleum fuel, myself included.

As to the pump, I would recommend a solenoid type electric placed inline just after the tank. Unlike most rotary pumps, the mechanical pump can pull fuel thru a solenoid type pump without it needing to be on. As an added benefit with that mounting location, the fuel is pushed thru the mechanical pump so the electric pump would also be useful in cases of vaporlock. Do make sure the rubber in the mechanical pump is in good condition though. With your new rebuild that should not be a problem.

Airtex makes a couple of decent 6v solenoid type pumps that will work and are sized for the 5/16" fuel line. The E8902 has a pressure out of 2.5-4.5 psi which closely matches the mechanical pump output. It is a bit low to push fuel thru the line and fuel pump and then the filter but should still work with the paper filter element without issue. For pushing fuel thru a ceramic element, the E8011 at 5-8 psi might be the better choice. By the time fuel gets thru the length of the line and the fuel pump the starting pressure will have dropped a bit and after the ceramic filter it should be in a satisfactory pressure range to not flood the carb. Some parts stores carry Airtex but most will have some brand pump -- but do try for a solenoid type and pay attention to the output pressure. Amazon may still carry some Airtex models too.

Electrically, if you want you can power from the coil terminal at the back of the ign switch. That way the pump will only operate with the key to the right or run position. If you prefer to use the GA terminal where an accessory is typically powered, it will work with key in either direction. Place an inline fuse of 10 amps (or whatever the install instructions recommend) in the wire before an on/off switch and then mount the switch on the dash edge so it is hidden. Some of the dashes may have an extra hole just perfect for a switch.

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