Phillip G. Posted March 10 Share Posted March 10 Hey fellas! I decided to make a part 2 because part 1 has 55 replies thanks to everyone. I've decided to cut all the vacuum & ECM wiring out and just rewire and plumb what's needed for a carbureted engine. I've also decided to go with a pre-electronic ignition setup. I've installed Ekhlin points & condenser in addition to an internally resisted Ekhlin IC-14 ignition coil that measures out at 3.5 ohms so that all should be fine. At Gary & Jim. after I cut out all the ECM wiring and rewired some of the mess the former owner had, the fuel gauge started working. He had that all wrong per my schematics. I believe for now, I'll just use the electric pumps with a pressure regulator until they fail. Then I'll install an eccentric fuel pump. Question, can you buy just a tank sending unit for these single tank trucks? Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted March 10 Share Posted March 10 Sure you can buy a sender. The issue with '86 is that it has a big bung, so you have to get one for a 351HO/460 that had the mechanical fuel pump. JBG seems to have them for a decent price. Link to comment Share on other sites More sharing options...
mat in tn Posted March 11 Share Posted March 11 Sure you can buy a sender. The issue with '86 is that it has a big bung, so you have to get one for a 351HO/460 that had the mechanical fuel pump. JBG seems to have them for a decent price. one for a 4.9 will work also. that makes it quite common. Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted March 11 Share Posted March 11 one for a 4.9 will work also. that makes it quite common. Does the 4.9 have a return, or do they get a 3 port valve and just a pickup, deadheaded again the float valve? I thought by '86 (big bung) the 4.9 had an in-tank pump.. Link to comment Share on other sites More sharing options...
mat in tn Posted March 11 Share Posted March 11 Does the 4.9 have a return, or do they get a 3 port valve and just a pickup, deadheaded again the float valve? I thought by '86 (big bung) the 4.9 had an in-tank pump.. there is not a return. the 85/86 has the big opening to be efi 5.0 compatible with the in-tank pump but the 4.9 did not go efi til 87 so 85/86 got the 84 sender in the large plate. single port. Link to comment Share on other sites More sharing options...
Phillip G. Posted March 11 Author Share Posted March 11 Sure you can buy a sender. The issue with '86 is that it has a big bung, so you have to get one for a 351HO/460 that had the mechanical fuel pump. JBG seems to have them for a decent price. Jim & Mat, I did think I may have to get one for a different engine as I've done that a lot over the years. So, either 351, 400, or 300 for an '86 will all work it sounds like. Mat, Im missing something here i think. If the 300 in tank sender doesn't have a fuel return port how does that work? Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted March 11 Share Posted March 11 Jim & Mat, I did think I may have to get one for a different engine as I've done that a lot over the years. So, either 351, 400, or 300 for an '86 will all work it sounds like. Mat, Im missing something here i think. If the 300 in tank sender doesn't have a fuel return port how does that work? 400 went out in '83, so it has the small bung, and won't fit. If you have a single line (no return) use the 300/4.9 sender. Link to comment Share on other sites More sharing options...
Phillip G. Posted March 11 Author Share Posted March 11 400 went out in '83, so it has the small bung, and won't fit. If you have a single line (no return) use the 300/4.9 sender. Yes, I meant to say 460. Mine has duel lines so I'll need to go with the '86 351/460 sender. Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted March 11 Share Posted March 11 Yes, I meant to say 460. Mine has duel lines so I'll need to go with the '86 351/460 sender. This was the distinction I was trying to make, but Mat said I was wrong. 🤷♂️ Link to comment Share on other sites More sharing options...
mat in tn Posted March 11 Share Posted March 11 This was the distinction I was trying to make, but Mat said I was wrong. 🤷♂️ well, there may be an added confusion here. the 85/86 4.9 and 5.8 sending unit has a large plate for the large opening tank and it has a single draw fuel fitting. on the 460, there was offered a "hot fuel" circuit with a continuous fuel return. I'm not certain of the years. this was used with an in-tank low pressure pump/sending unit. this is possibly the best example of how to do a carb setup. I'm certain that you can find info on this here in the doc/info. Link to comment Share on other sites More sharing options...
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