poor gas mileage

[Bill Ford]

Have completed the restoration on my '47 P-15S. Drives out good. Will be putting on new shocks soon and getting some play out of the steering. The gas mileage is about 10 MPG. Thought I remembered getting about 14 or 15 MPG. The car runs smooth , no hesitation, no smoking like it is running to lean. What do I need to do?

[1947PLEVY]

Bill:

It probably did get that gas mileage then...now they add the ethanol to it so you'll probably get about 10% less on your mileage..

Post some pics of your car for us all to see. It sure looks good to me..post some of the interior too, I need to see how the trim is installed on the door panels..

God Bless US All...John

[greg g]

Is the engine still tight from a rebuild??? Hopefully with some mileage it will loosen up a bit friction wise and begine to get better mileage. What size tires are you running with what rear gears.

[claybill]

i would start looking at the choke..maybe disconnect it for a test...and your idle adj screw should be 1 to 1 and 1/2 turns out. richer and it will feed gas all thru the run.

bill

[greg g]

Just posted to the thread regarding the power valve in the carb. I recall Bob VanBuskirk chased a low fuel milege dealwith some black smoke in his 54 Plymouth wagon after a rebuild. Even with his OD trans he was only getting 13/14 mpg.

I suggested he check out the power valve circuit and his problem was that the carb to maifold gasket was either incorrect or installed incorrectly and was blocking the vacuum port to the powervalve circuit. With that adressed he picked up 3/4 mpg.

In the pic the upper gasket has four slots, I have seen some rebuild kits with gaskets the have 0, 1, 2, or 4 slots depending on the source of the kit and its contents. Remember most kits are designed to fit a number of years and carb applications, make sure you get on that alignes with the hole in the carb base.

Check yours, and make sure the piston that controlls the circuit moves freely against its spring.