Holley 12-427 32 GPH Mighty Mite Electric Fuel Pump, 4-7 PSI

looks good havent used it

primes the carb after car has been sitting a few days or weeks , car start every time , no more waiting for the mach pump to prime the carb I only use this when starting the car . that or when racing to make sure there is no loss of fuel pressure with mech pump . if you have an older non fuel injected car this helps with reliability , car starts every time , don't need to crank the engine to get fuel to the carb . worth the money . Also easy to instal in cramped quarters can fit almost anywhere

Flows a good 4 psi works great for my 318 magnum carb swap with a 2 barrel 500cfm Holley

First: yes, this is a 'pass through' pump, and allows fuel to flow when off. I use it to prime my carb after my truck has been sitting for 2+ days. I have it on a momentary, push-button switch, and i prime it for 3-5 seconds then crank it over, and my mechanical pump takes over from there. It has been working (though I run it just a few seconds at a time) for several months- still strong.

Putting a BB Ford on road after 5 years. Failed mechanical pump. Used this as it matched edelbrock card requirements. Easy install. Built own harness. Make sure your keyed connection can carry 5 extra amps or run (quality) relay. Nice unit.