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09-28-2019, 08:42 PM | #1 |
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1980 with dual tanks HELP
I have a 1980 pickup with dual tanks. It has a relay timer on the fuse box part #14014527. What is this for? I removed it and the truck still runs and the tanks seem to still switch. The problem is it kills the battery when left on the left tank overnight. From what I can find out it's suppose to time out after 30 min plus or minus 10 min. I think it's bad. Any help?
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1980 Chevy Shortbed Pickup 1969 Z28 engine Turbo 350 |
09-29-2019, 12:19 AM | #2 |
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Location: Olympia, Washington
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Re: 1980 with dual tanks HELP
Here's what I found. Scroll down the page until you see the blurry pic with the GM box.
http://67-72chevytrucks.com/vboard/s...d.php?t=598604 |
09-29-2019, 09:55 AM | #3 |
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Re: 1980 with dual tanks HELP
It's a timer relay to keep the solenoid tank valve switched enabling fueling from the AUX tank during extended cranking.
GM only used this on a small number of 1980 squarebody trucks. http://67-72chevytrucks.com/vboard/s...54#post6354154 It's obsolete and a reliability issue. Id leave it unplugged.
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1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
09-29-2019, 11:51 AM | #4 |
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Re: 1980 with dual tanks HELP
Thanks guys for your help. I still would like to know what will happen if you remove the relay? Would you have to run on just one tank?
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1980 Chevy Shortbed Pickup 1969 Z28 engine Turbo 350 |
09-29-2019, 01:15 PM | #5 | |
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Re: 1980 with dual tanks HELP
Quote:
According to the GM wiring diagram it's supposed to retain power for ±30 minutes (20-40 minutes)... GM did kind of a poor job of drawing the internals of that relay. It looks like you can't use the AUX tank without the relay or some kind of workaround. A fairly easy workaround, that's reversible should you find a working time delay relay, would be a 6" chunk of 14ga SXL automotive wire and two male 1/4 disconnect terminals... Plug this jumper wire into the relay socket from the Pink/Black Ignition power wire socket to the Green wire socket that provides the dual tank switch with power. This would bypass the relay and revert it the 1973-1979 system.
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1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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09-29-2019, 07:13 PM | #6 |
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Re: 1980 with dual tanks HELP
Thanks Hatzie, I have a relay coming but just wanted to know if I can drive it until it gets here. I removed the bad relay and I'll leave it on the right tank and see what happens.
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1980 Chevy Shortbed Pickup 1969 Z28 engine Turbo 350 |
09-29-2019, 07:32 PM | #7 |
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Re: 1980 with dual tanks HELP
Hatzie, I was just thinking about the jumper wire you said to put in. It wouldn't be a timer and would stay on all the time and kill the battery wouldn't it?
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1980 Chevy Shortbed Pickup 1969 Z28 engine Turbo 350 |
09-29-2019, 08:34 PM | #8 |
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Re: 1980 with dual tanks HELP
No.
The relay is triggered by the Pink/Black Ignition power wire. This closes the relay switch terminals between the Orange battery power wire and the Green valve supply wire til the timer runs down. Plugging in the jumper the way I suggested will tie ignition power to the Green valve supply wire. When you switch the ignition off the power to the valve is switched off.
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1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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