Question about 1989 Ford F 250

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Rear tank full and selected for use but draws from the front

Filled up the rear tank and put about 1/3 in the front. Selected the rear tank for use (driving back and forth to work) I noticed that the rear tank never got below Full, but the front tank was about empty! I also noticed that when I would drive at freeway speeds, (above 60) with the selector in the rear tank position, old Betsy would spit and try to stall. I would switch to the front tank and all would be well at higher freeway speeds. It runs fiine at about 55 in the rear tank position. So I guess my question is: Is it the low pressure pump in the rear tank or the tank switch.....or both?

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  • tom_a_white Nov 21, 2008

    Yes, it ran ok on rear tank, but I think it is drawing from the front tank. The reason I say this is because I ran all week on the rear tank, but it never got off full. I noticed that the front tank was almost empty. I believe we are on the right track. I siphoned the rear tank last night and put it all in the front and we are rocking and rolling. This I did after coming to a complete halt with the rear tank selected and would not start until I switched to the front and had siphoned the fuel to the front.


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Hi your symptoms suggest that you have slight blockage either in fuel line or most likely at point where rear tank fuel line enters the switch over reason ? you say runs ok on rear tank at 55mph? but when demand for more fuel / speed above that pump /engine cannot deliver ? due to narrowing of fuel line (tuberculation) so check flow from r/tank and for any debri inside?

Posted on Nov 20, 2008

Testimonial: "Found that the fuel line to the tank switch was not all the way installed. I just needed a little more umph to get ito lock on the retainer.......grrr"

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