Help Me Please
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Help Me Please
I have a 1982 Ford F350 6.6L with dual tanks, when I bought the truck the rear tank was not working, I tried to switch it and the engine died so I switched back to the front and kept it there. The other day i was going to take it to the dunes and it would not start. I had it running the night before to do some errands around town with nothing out of the ordinary happening. I listened for the fuel pump in the run position and could not hear any noise. I checked the fuses and all were good. I bought a new fuel pump and switched it out, that didnt work I got out my circuit tester and realized I was not getting any power to the fuel pump. I followed the wire and it went to the 6 prong plug that goes to the fuel selector, I have power there but I cannot get power to the fuel pump Has anyone had a problem with this that can help me out? Is it the switch in the dash? is the problem in the ignition? what would make it have no power to the pump but I have power to the fuel tank selector?
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the fuel selector has wires going into it, but only hoses going out. so I dont have any way of telling if the selector is working or not, they are 80 bucks so I dont want to buy one if thats not what it is, I have thought that may be it though, I almost bought one tonight, I want to see if anyone has had this problem and what the solution was. It is 30 years old, so it may not hurt to have a new one anyway, thanks for the suggestion.
FTE Legend
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From: Northeast, OK
No, we are talking at cross-purposes. I meant selector SWITCH and I think you meant selector VALVE. The switch drives the valve, which picks the tank. I was wondering if the switch has gone bad.
As for the pump, I think the 82's had mechanical pumps, not electical. The in-tank electrical pumps didn't come out until later on the carb'd models. But, you said 6.6 liter and 1982 in the same sentence and I thought the 6.6/400 was gone by 82. So, we need to figure out what you really have. Is it a 6.6/400? Does it have mechanical or electric pump(s)?
As for the pump, I think the 82's had mechanical pumps, not electical. The in-tank electrical pumps didn't come out until later on the carb'd models. But, you said 6.6 liter and 1982 in the same sentence and I thought the 6.6/400 was gone by 82. So, we need to figure out what you really have. Is it a 6.6/400? Does it have mechanical or electric pump(s)?
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As for the pump, I think the 82's had mechanical pumps, not electical. The in-tank electrical pumps didn't come out until later on the carb'd models. But, you said 6.6 liter and 1982 in the same sentence and I thought the 6.6/400 was gone by 82. So, we need to figure out what you really have. Is it a 6.6/400? Does it have mechanical or electric pump(s)?
No electric fuel pumps on the 400, only mechanical.
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electric fuel pumps in the tanks mechanical fuel pump in the block but it has no hose coming out of it. yeah I meant the valve. The 6.6L 400 was the biggest engine you could get from 80-82 they stopped putting in the 460 for three years. I checked the switch in the dash and it was working power in and out. just wondering if it went somewhere where it could still be a bad switch
Last edited by Demeron; Oct 4, 2012 at 11:23 PM. Reason: added more info
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My understanding is the 400 was used in F250/350 through 1982.
In any event, it didn't come from the factory with electric/in-tank pumps, some PO did that to you.
In any event, it didn't come from the factory with electric/in-tank pumps, some PO did that to you.
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Yes, you must have something rigged in from a previous owner. If you have in-tank pumps, then it must be a setup from a little bit later 460 setup.
With the 460 setup, the dash switch selected the fuel pumps, or on some of them a relay did this. On all of them, there was one single wire to the selector valve that switched the valve, and the other wires to the valve were the sending unit wires, and the selector valve when it moved, had a set of contacts inside it and selected the correct sending unit for the fuel gauge to read the correct tank.
You have some decisions to make. You have several ways to go, since none of this is original. If it were mine, I would get rid of the electric fuel pumps and go back to the one on the engine.
With the 460 setup, the dash switch selected the fuel pumps, or on some of them a relay did this. On all of them, there was one single wire to the selector valve that switched the valve, and the other wires to the valve were the sending unit wires, and the selector valve when it moved, had a set of contacts inside it and selected the correct sending unit for the fuel gauge to read the correct tank.
You have some decisions to make. You have several ways to go, since none of this is original. If it were mine, I would get rid of the electric fuel pumps and go back to the one on the engine.
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I think it may have been a rig from a previous owner, however, there must have been some with electric fuel pumps, because when I went to autozone and oreilly's they both had electric fuel pumps for 82 f350's with a 6.6L also my chiltons manual talks about the electric and mechanical fuel pumps. I have heard from a few people that it may be the relay where is this relay located? also does the pump run the entire time the vehicle is running or does it turn on and off to maintain pressure? thoughts?
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I was apparently wrong about the 400. Sorry.
As for the electric pumps though, the Ford Master Parts Catalog lists only one fuel pump on all 80 - 81 351M's and 80 - 82 400's for F150-350. It is #E1TZ 9350-H and I know for a fact that it is a mechanical pump. So, I'm quite confident that your in-tank pumps were added later. And I'd bet that your tanks may have been swapped as, from what I have seen, the tanks that have pumps have a larger opening in them to allow the pump to go in.
I wouldn't hesitate to ditch the electric pumps. I've seen many threads on here where people bemoan the short lives of the available electric in-tank pumps, but no threads discussing problems with mechanical pumps.
As for the electric pumps though, the Ford Master Parts Catalog lists only one fuel pump on all 80 - 81 351M's and 80 - 82 400's for F150-350. It is #E1TZ 9350-H and I know for a fact that it is a mechanical pump. So, I'm quite confident that your in-tank pumps were added later. And I'd bet that your tanks may have been swapped as, from what I have seen, the tanks that have pumps have a larger opening in them to allow the pump to go in.
I wouldn't hesitate to ditch the electric pumps. I've seen many threads on here where people bemoan the short lives of the available electric in-tank pumps, but no threads discussing problems with mechanical pumps.
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In any event, it seems this configuration is exceedingly rare, I think I can count on one hand the number of times I've been in the 9350 section of the catalog.
So - which one does the OP have? I have no idea. Perhaps if the unit was removed and the identification numbers on it posted here (pictures would be helpful, too!) we could help some more.
To the OP - others here have the 1982 wiring diagrams and can maybe look for fuel pump relays (EDIT: I pinged Ralph, maybe he can help if he has time) and can see if they existed back then. I have the 1981 diagrams, I don't recall any fuel pump relays but I'd have to explicitly look again.
FTE Legend
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From: Northeast, OK
Gary - I was getting ready to say the same thing, but, scroll down.... there is also E0TZ-9350-B (Sec. 93 Pg. 22) which apparently could have been with "ALL" engines.
In any event, it seems this configuration is exceedingly rare, I think I can count on one hand the number of times I've been in the 9350 section of the catalog.
So - which one does the OP have? I have no idea. Perhaps if the unit was removed and the identification numbers on it posted here (pictures would be helpful, too!) we could help some more.
To the OP - others here have the 1982 wiring diagrams and can maybe look for fuel pump relays (EDIT: I pinged Ralph, maybe he can help if he has time) and can see if they existed back then. I have the 1981 diagrams, I don't recall any fuel pump relays but I'd have to explicitly look again.
In any event, it seems this configuration is exceedingly rare, I think I can count on one hand the number of times I've been in the 9350 section of the catalog.
So - which one does the OP have? I have no idea. Perhaps if the unit was removed and the identification numbers on it posted here (pictures would be helpful, too!) we could help some more.
To the OP - others here have the 1982 wiring diagrams and can maybe look for fuel pump relays (EDIT: I pinged Ralph, maybe he can help if he has time) and can see if they existed back then. I have the 1981 diagrams, I don't recall any fuel pump relays but I'd have to explicitly look again.
You are right, Chris, there is an "all". In fact, apparently 2 versions of it for the aft tank, which could be steel or plastic, and two versions of the mid tank, all of which appear to have been steel.
And, you are right that we need to see what the OP has. But, in the face of having been wrong twice already I'll stand by my previous statement: I would switch to a single mechanical pump and ditch the electric pumps. That is, of course, unless this is to be a #'s-matching restoration, as this configuration really must be rare, so finding parts probably won't be easy, nor cheap. And, the mechanical pumps have served quite well w/o widespread problems while even the more common electric pumps have been very problematic and expensive. Just think how much fun a rare one would be.
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I agree with you about the reasons for switching to mechanical pumps, but isn't it more involved than just the obvious plumbing? There will also be the switch, valve, wiring & fuses/circuits, and making the dash gauge work correctly in all cases.
IOW it's probably a bigger deal than it seems on the surface.
Maybe this thing was originally a cab & chassis, or a fleet truck, or some other "non-standard but yet there were millions of them" configuration.
IOW it's probably a bigger deal than it seems on the surface.
Maybe this thing was originally a cab & chassis, or a fleet truck, or some other "non-standard but yet there were millions of them" configuration.
FTE Legend
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From: Northeast, OK
I agree with you about the reasons for switching to mechanical pumps, but isn't it more involved than just the obvious plumbing? There will also be the switch, valve, wiring & fuses/circuits, and making the dash gauge work correctly in all cases.
IOW it's probably a bigger deal than it seems on the surface.
Maybe this thing was originally a cab & chassis, or a fleet truck, or some other "non-standard but yet there were millions of them" configuration.
IOW it's probably a bigger deal than it seems on the surface.
Maybe this thing was originally a cab & chassis, or a fleet truck, or some other "non-standard but yet there were millions of them" configuration.
Or, he could do like I have and jettison the extra tank. I don't drive on long enough trips to make anything more than 19 gallons a benefit, and keeping the fuel in two tanks fresh is a pain. And today's fuel doesn't stay fresh nearly as long as it used to do given the ethanol in it. So, I pulled the rear tank and bypassed the valve. Problem solved.
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My 1982 wiring diagrams mention nothing about the in-tank fuel pumps.
I see where there are low pressure in-tank pumps in the parts book though. Look up the comon 9275 number. The pump is a part of the Sending Unit from what I can tell, just like on the 1985-1986 versions. Have no idea which one he needs though, (need to know size of tank, if it's plastic, or front or rear etc...) and I doubt the pumps are the problem anyway.
I would personally check the in dash switch for a fault. Since my wiring diagram does not cover that system, I would need the owner to tell me what colored wires there are at the sending units. Should be three wires at each sending unit, and tell me the wires at the selector switch, and at the selector valve. With that information, I could help further in diagnostics.
I see where there are low pressure in-tank pumps in the parts book though. Look up the comon 9275 number. The pump is a part of the Sending Unit from what I can tell, just like on the 1985-1986 versions. Have no idea which one he needs though, (need to know size of tank, if it's plastic, or front or rear etc...) and I doubt the pumps are the problem anyway.
I would personally check the in dash switch for a fault. Since my wiring diagram does not cover that system, I would need the owner to tell me what colored wires there are at the sending units. Should be three wires at each sending unit, and tell me the wires at the selector switch, and at the selector valve. With that information, I could help further in diagnostics.