The Ford Barn - View Single Post - Misfiring and backfiring when engine is warm

H. L. Chauvin · 07-01-2013, 10:07 AM

Mr. Swoft is correct -- it definitely sounds like your engine is not getting enough fuel.

1. The fuel filter is clean ??? -- is this the fine mesh screen on top of the glass bowl, or some type of "in-bowl", or "in-line" fuel filter.

2. Because Model A's have weak flowing, gravity flow fuel. in lieu of stronger flowing fuel pumps delivering fuel, many fuel filters in Model A's do not allow enough liquid fuel to more rapidly flow through them.

3. After running 10 minutes or so, the liquid fuel inside of your filter is drained & it is full of air -- then wait a few minutes & the filter re-fills with liquid fuel; or on the other hand, if your engine runs at very low speed, the filter allows your very slow flowing fuel to run the engine slowly.

Get back & many will be glad offer suggestions -- good day!

07-01-2013, 10:07 AM	#12
H. L. Chauvin Senior Member Join Date: May 2010 Posts: 4,179	Re: Misfiring and backfiring when engine is warm Mr. Swoft is correct -- it definitely sounds like your engine is not getting enough fuel. 1. The fuel filter is clean ??? -- is this the fine mesh screen on top of the glass bowl, or some type of "in-bowl", or "in-line" fuel filter. 2. Because Model A's have weak flowing, gravity flow fuel. in lieu of stronger flowing fuel pumps delivering fuel, many fuel filters in Model A's do not allow enough liquid fuel to more rapidly flow through them. 3. After running 10 minutes or so, the liquid fuel inside of your filter is drained & it is full of air -- then wait a few minutes & the filter re-fills with liquid fuel; or on the other hand, if your engine runs at very low speed, the filter allows your very slow flowing fuel to run the engine slowly. Get back & many will be glad offer suggestions -- good day!