return brings out air-bubbles when i crank; when i stop its return comes normal on 2004 Ford F-350 Super Duty

when i crank the car the return brings out air like bubbles but when i stop cranking the return comes normal. i have change the fuel pump but am still have the same problem.

by in Athens, WV on June 19, 2013
2 answers
ANSWER by on June 19, 2013
Out of fuel.
ANSWER by on June 19, 2013
fuel pump is poss failing

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