fuel mileage.

Asked by Guru595Y7 Dec 18, 2017 at 11:44 AM about the 1990 Ford F-150 XLT Lariat LB

Question type: Maintenance & Repair

a 1990 F150 XLT Lariat 5.0 and I get better
gas mileage out of the front fuel tank than I do
the rear fuel tank any guesses as to why

5 Answers

F_O_R answered 6 years ago

That makes no sense. Probably just a perception issue.

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Guru595Y7 answered 6 years ago

Two 16gal tanks front tank I get roughly 150 miles out of it the rear tank I get 100 or less.

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Guru595Y7 answered 6 years ago

Ran front tank dry to make sure rear tank wasn't siphoning back into the front tank somehow (been told it happens on these older trucks with duel tanks) and it's not.

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GuruHGZCJ answered 4 years ago

Fuel return line is running to the front tank, slowly adding fuel as your truck runs. To see this in action run front tank dry, and run only on rear tank, before you know it you'll have a reserve supply up front

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GuruHGZCJ answered 4 years ago

Fuel return line is running to the front tank, slowly adding fuel as your truck runs. To see this in action run front tank dry, and run only on rear tank. Before you know it you'll have a reserve supply up front

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