Question about 1987 Ford Econoline
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Posted on Jan 02, 2017
Theres 2 pumps one in the tank, lift pump, and one in the chassis rail under the driver side. The one in the tank is cheap, the one in the rail is not. The one in the tank only produces low pressure to prime the main pump and if it is broken, may not cause that much of an issue except when starting. the one in the rail is a no-start if it fails. The idea is that the rail pump can supply high pressure for the injectors, so a fuel pressure test at the injector rail will determine which pump is playing up. Hope that helps Tim
Posted on May 26, 2010
The fuel pump inertia switch that shuts off the pump in the case of an accident or impact is located under the right side of dash I have also
found them behind the right kick panel. There is also a fuel pump
shutoff relay under the hood on the left firewall, and a relay on the
right fender apron behind a plastic cover. Hope this helps.
Posted on Jul 07, 2010
Having worked for Ford for 25 years and having seen this very same problem (fuel flows between tank and overflows) many times there is only one cause of the fuel flooding the other tank, the fuel switching valve on the frame rail under the truck is detective, this valve contains special silicone rubber poppet valves that open when the front or wear tank fuel pump is selected, it then seals when the tanks electric pump is shut off at the selector switch, your poppet valves are leaking, all to a common problem. Back in 2000 when I retired this switching valve was no longer sold by Ford parts, it is obsolete. I suggest you check with Ford to see if it is available from some other source or call a local parts store like NAPA or Carquest and inquire is anyone in the aftermarket has them. The last choice is a used one, but of course it could have the same problem as yours as age and deterioration of the rubber valves is what makes them leak.
Posted on Oct 31, 2011
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