Classic/Antique Car Repair/1926 Lincoln Limo

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Expert: - 4/27/2011


Question
We are working on a 1926 Lincoln Limo, the only thing not stock on it is an electric fuel pump has been added. At times it will run perfect, other times it will run rough and backfire. The fuel in it is fresh, when it backfires, it may come out the exhaust or the intake area. Any help would be great thanks.
Brandon

Answer
Sounds like a great project. I have my doubts if the electric fuel pump is the problem, but you can take a volume and pressure test on the pump. It should pump between a pint and a quart a minute and the pressure should be about 4 to 6 PSI. The pump should also be mounted as close to the tank as possible and as low on the chassis as possible. Electric pumps are not puller as are the mechanical pumps but are pushers. Where you have fire coming out of both intake and exhaust I would suspect valve or ignition electrical problems. Have you taken both hot and cold compression tests on the engine? That would be my starting point. Take the test and then get back to me and we will go from there.

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Brad Sears

Expertise

All automotive including antique and collectible. However if the car has been modified I can only answer in general terms and maybe get you pointed in the right direction.

Experience

Automotive tech instructor. Syndicated auto columnist 1970's though the early 1990's. Syndicated auto radio talk show, Ask Brad About cars, CBS Radio 70's through 90's TV Show "Last Chance Garage" 1980's PBS-TV syndicated. Auto instructor for the following companies: Fram Autolyte Holly Carter AMF Ford Motor University Of Conn Blue Hills Technical School Sugar River Technical Center Grew up in a family garage in Needham Mass and turned wrenches from the age of 14.

Publications
Manchester Union Leader, Nashua Telegraph, Motor Service Magazine, Yankee Magazine, Popular Mechanics (Saturday Mechanic early 80's), Los Angeles Times, New York Times, and lots more.

Education/Credentials
More than I care to remember. Basically Franklin Technical Institute in Boston, Northeastern University, Fitchburg State Teachers College, Tufts University, and a lot of factory schools along the way.

Awards and Honors
Moto Award winner. And much more.

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