Hi there,
I have an incredibly clean Ford F-150 from 1995, with the 4.9 and dual tanks.
I have noticed an odd fuel delivery issue. After driving on the highway for a few hours, I notice a small engine stutter. It will gradually increase to a full-on rocking motion back and forth as if someone is flipping the ignition on and off on purpose. I can switch to the other tank and it immediately picks back up just fine, but will steadily fall into this range of motion just like before.
I believe I have isolated it to the reservoir switching unit which must be switched out. While doing this I will do both pumps as I don't believe they have ever been done.
Another odd bit: When I switch from the rear tank to the front tank, often there will be more in the front tank than I remember. Am I correct in thinking the front tank could be pulling fuel out of the lines from the rear and causing the issues because the fuel pumps cannot keep up with a constant pressure loss under load?
I am inclined to do the switching unit and both pumps just as preventative maintenance. Does anyone have any other ideas before I do this?
I have an incredibly clean Ford F-150 from 1995, with the 4.9 and dual tanks.
I have noticed an odd fuel delivery issue. After driving on the highway for a few hours, I notice a small engine stutter. It will gradually increase to a full-on rocking motion back and forth as if someone is flipping the ignition on and off on purpose. I can switch to the other tank and it immediately picks back up just fine, but will steadily fall into this range of motion just like before.
I believe I have isolated it to the reservoir switching unit which must be switched out. While doing this I will do both pumps as I don't believe they have ever been done.
Another odd bit: When I switch from the rear tank to the front tank, often there will be more in the front tank than I remember. Am I correct in thinking the front tank could be pulling fuel out of the lines from the rear and causing the issues because the fuel pumps cannot keep up with a constant pressure loss under load?
I am inclined to do the switching unit and both pumps just as preventative maintenance. Does anyone have any other ideas before I do this?