fords4life Posted February 10, 2018 Share Posted February 10, 2018 So.... The selector switch does not switch the tanks on my 86, nor does it switch the gauge. I bought an NOS switch at a swap meet for a decent deal but it is the 5 pin and I have a 6 pin. Decided to try to check some things at the switch since it was apart but my wire colors do not match any of the wire colors in the 86 EVTM. Front tank works just fine but I get nothing from the back tank. I still need to crawl underneath and check the rear tank connections. Here are the wire colors I have: Am I missing something in the EVTM? Link to comment Share on other sites More sharing options...
NotEnoughTrucks Posted February 10, 2018 Share Posted February 10, 2018 Carbureted or fuel injected? There is an interesting discussion going on in Gary's Big Blue thread. I think that 5 pin switch may be for the carbureted truck with the 6 port valve. Link to comment Share on other sites More sharing options...
fords4life Posted February 10, 2018 Author Share Posted February 10, 2018 Carbureted or fuel injected? There is an interesting discussion going on in Gary's Big Blue thread. I think that 5 pin switch may be for the carbureted truck with the 6 port valve. EFI Link to comment Share on other sites More sharing options...
Gary Lewis Posted February 10, 2018 Share Posted February 10, 2018 It looks to me like the wires match very well. I suspect you are looking at the wrong diagram. Look at Page 104 here: Electrical/EVTM/1986 EVTM/Electric Fuel Pump Control. Or, look here: Fuel Systems/Fuel Systems Wiring and look at the 5.0L tab. Same page from the EVTM, but the latter shows the 5-pin vs 6-pin switch and gives you part numbers. But confirm that you don't have a switching valve on the frame rail. You shouldn't, but just to make sure.... Link to comment Share on other sites More sharing options...
fords4life Posted February 10, 2018 Author Share Posted February 10, 2018 It looks to me like the wires match very well. I suspect you are looking at the wrong diagram. Look at Page 104 here: Electrical/EVTM/1986 EVTM/Electric Fuel Pump Control. Or, look here: Fuel Systems/Fuel Systems Wiring and look at the 5.0L tab. Same page from the EVTM, but the latter shows the 5-pin vs 6-pin switch and gives you part numbers. But confirm that you don't have a switching valve on the frame rail. You shouldn't, but just to make sure.... Apparently I've lost a page of the EVTM and didn't realize it. I did not have that diagram. Now I feel like an idiot. No switching valve, just the "reservoir". Link to comment Share on other sites More sharing options...
Gary Lewis Posted February 10, 2018 Share Posted February 10, 2018 Apparently I've lost a page of the EVTM and didn't realize it. I did not have that diagram. Now I feel like an idiot. No switching valve, just the "reservoir". Idiots don't ask questions. Glad you did. Link to comment Share on other sites More sharing options...
fords4life Posted February 12, 2018 Author Share Posted February 12, 2018 Idiots don't ask questions. Glad you did. So I confirmed the rear tank sending unit/pump is plugged in. Next up is to confirm that the truck is sending power to the pump when I flip the switch. Does anyone have the shop manual that could post the Ford diagnostic stuff for the dual tank system on a 5.0? The EVTM only references a couple of things. I have checked all but the G201 ground down by the drivers side kick panel. Link to comment Share on other sites More sharing options...
Gary Lewis Posted February 12, 2018 Share Posted February 12, 2018 So I confirmed the rear tank sending unit/pump is plugged in. Next up is to confirm that the truck is sending power to the pump when I flip the switch. Does anyone have the shop manual that could post the Ford diagnostic stuff for the dual tank system on a 5.0? The EVTM only references a couple of things. I have checked all but the G201 ground down by the drivers side kick panel. I have an '85 shop manual, but the setup you have came out mid-year so it may not have it. I'll check in a bit - after I finish this cup of French Roast and enjoy the sun coming into our sun porch while it is 17 degrees outside. Link to comment Share on other sites More sharing options...
fords4life Posted February 12, 2018 Author Share Posted February 12, 2018 I have an '85 shop manual, but the setup you have came out mid-year so it may not have it. I'll check in a bit - after I finish this cup of French Roast and enjoy the sun coming into our sun porch while it is 17 degrees outside. Thanks and no rush. I doubt I'll be doing much on it until this weekend or next week. The schedule this week is a little hectic. Link to comment Share on other sites More sharing options...
Gary Lewis Posted February 12, 2018 Share Posted February 12, 2018 Thanks and no rush. I doubt I'll be doing much on it until this weekend or next week. The schedule this week is a little hectic. Ok, I put up what the 1985 shop manual says on this page: Fuel Systems/Diagnostics. However, it shows just what the 1985 EVTM shows - that the 1985 EFI'd 5.0L had a 6-port fuel tank selector valve. But Bill says he's never seen one and thinks all the EFI'd 5.0's came without it. Besides, yours in an '86 and the '86 EVTM doesn't show one. So you need to ascertain if your truck has one. I don't think it does, so that procedure really won't help you. And I don't have a 1986 shop manual. Sorry. Link to comment Share on other sites More sharing options...
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