Re: Fuel Boiling Out Of Carburetor

Posted by Packard 1948 On 2015/9/4 9:45:04

I installed a Holley Projection 4DI on a small block mopar about 12 years ago. OK-ish system.

If you were going to install FI on a Packard engine you will need a 12 VDC (actually 13.5 VDC) negative ground electrical system and the cooling system will really need an upgrade because the EFI will be burning the fuel at close to 12.5:1 in closed loop and that is rather hot for the old Packard cooling system to absorb.

I am running steel lines from the fuel pump to the glass bowl filter but do not have the fuel pump heat shield installed (did not have one) and on one hot day (95-ish F) after idling following a high speed cruise I could watch the fuel boiling (bubbling at least with the bowl half empty) inside the glass bowl while the engine was running. The engine was idling fine so I forgot to test if the electric fuel pump would provide enough pressure to prevent the bubbling.

And yes...the CARB fuel is not good in the carb.