Dual fuel tank help please
 

My grandfather has a 1987 V10 with the 305 and it cut out on him the other day. Now it will turn over, but not start. I spent a little time looking at it today and it is not getting fuel to the throttle body. I can hear a fuel pump run when it is on LEFT tank, but no pump noise when on RIGHT tank. I pulled the fuel filter and turned the key to the "ON" position and heard the pump run but no fuel came from the lines (left tank only, I tried right but no pump noise). I have not worked on the dual tank setup at all so can anyone explain this to me please?

Is there only one pump, or two?
There is only one fuel filter so I am assuming one tank pumps into the other? Left to right maybe?
It looks like the right tank is the main tank that feeds the throttle body, so if that pump quits there will be no fuel regardless of the LEFT pump working?

Any info is much appreciated. I hope to get the parts and make another trip down there to fix it, but he is two hours away so I would like to have what I need before I go.

Re: Dual fuel tank help please
 

One fuel pump in each tank... 2 fuel pumps.
Not in stock dress. The selector valve switches the feed and return lines from Left or Right tanks to the engine compartment fuel feed and returns. The fuel filter is after the valve.

No.

It sounds like the selector has moved to the RIGHT tank then hung... And... the RIGHT tank has a fuel pump issue.

Re: Dual fuel tank help please
 

I'd unplug the selector switch and try jumping it. Odds are good in my experience that the selector switch went bad. I've had three go bad on me in the last two years. Three dif trucks. All of them sat for a couple years then woulndt start. That 12$ switch was the culprit on my 80,86 and 87. You can diagnose but operating the switch with key on truck off you should be able to hear the selector move its kind of a hollow clunking noise. For lack of a better term
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Re: Dual fuel tank help please
 

Thanks for all the help. I will go down there this weekend with a selector and a pump and I feel confident we can get it going. Thanks again.