I just bought 1991 f150 4.9 dual tank the rear tank works fuel level and pump
switch it to front and gauge drops to bottom and no noise from pump and will not
start checked all possible contacts and did not see anything unusual is there
any way to check wiring for power or any good thoughts?? I was about tempted to
make some jumper leads to see if pump is good (taking wiring off rear tank and
put to front to make sure not issue in tank) just grabbing straws
On Sun, 30 Mar 2014 20:17:27 +0000 (UTC), Kevin Bottorff
But if the pump does not work he STILL doesn't know if it's a bad
pump or bad wiring. To test the pump you need to apply power AT the
pump. If it works jumpering the selector but not with the selector all
you have tested is the selector. If it doesn't work, you have not
On Mon, 31 Mar 2014 16:45:34 +0000 (UTC), Kevin Bottorff
Someone is not understanding someone else here.
If by "jumpering" you mean taking power from the selector switch and
using jumper leads going directly to the front pump, yes that will
work. If, on the other hand, by "jumpering" you mean bypassing the
switch or connecting the wires from the selector switch to the front
pump to the connections at the swith for the rear pump, then my
concern is valid.
"jumpering" is a bit ambiguous. Jumpering "at the selector switch"
sounds a whole lot like making all the test connections "at the
switch" because it is closer and easier than "trying to get at the
tank wiring" which I interpreted as getting to the front tank wiring.
both front and rear tank are hard to get at directly unless you lower
the tank, so do the quick test first at the selector valve on the frame
rail right next to the fr tank. if that fails you can know either way
your dropping the front tank. if it works then nothing else is required
outboard of the selector switch, (which are not unusual to have problems,
as is the pumps in the tank going out.) KB
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