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Sorry, been away from computer. Thats the only guidance I have seen on that.Howdy,
Nevermind. Going back and forth reading to many TM's
Here it is.
Set float switch stem 1/16 inch from bottom of fuel tank . Tighten switch plate adjusting nut. Connect electrical connector and remove tag. Install front housing panel, paragraph 2-18.4. Connect negative battery cable and close access door
Yes, I suspect the float switch module which is the box mounted to the right side. The power from S1 pin 5 comes into J15 pin 2 plug right before the module and then goes to P12 pin 2 which is the plug on the float itself. If you jump J15 Pin2 and Pin1 (before the module) it will activate the pump. But if you jump J12 Pin2 and Pin1 nothing. When you jump Pin 1&2 on J12 it should activate the pump but it doesn't, my voltage drops to 7.If I understand you correctly you suspect the actual liquid level sensor?? If so, it is highly unlikely that several LLS are bad. So, if you suspect the LLS, I'd try to make sure that the float isn't binding somehow. Also. for the 2a (which I think is what you have) it is a definite "Z or J" shape, whilst the 3a is more like a sideways "N" shape. The floats are mounted a little differently on the 2a vs the 3a. Whilst the two LLS function the same, and kinda look alike, I don't think they are interchangeable.
If by module you mean the unit on the lower side of the unit, then I'd still suspect something weird rather than the unit itself. 3 bad modules in a row seems awfully unlikely. I've seen pins in plugs that have lost their retainer and the pin itself is shoved backwards. To make matters worse I've seen pins like that that still appear to stick out enough to make contact. I've seen wires broken internally that otherwise look just fine. Or perhaps just enough corrosion on either the male or female side of a plug as to not make contact (doesn't take too much).
Could be that some hammerhead miswired a pin somewhere...
This is the kind of problem in which you will learn more than you ever wanted to know about that circuitry.