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Old 02-22-2024, 09:58 PM   #1
Wildstreak
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6.2 fuel sending unit advice

I have a cummins swapped k30 crew cab and recently my tank started leaking so I got a new tank and a diesel sending unit for the driver side. The problem I have is the new diesel sending unit has a ground wire attached to nothing in it and I have no idea where it goes because the old gas unit does not have the same wiring. Anyone have any idea where it should go? I dont like the idea of a wire just lose in the tank. and info would be greatly appreciated!
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Old 02-23-2024, 08:54 AM   #2
adf5565
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Re: 6.2 fuel sending unit advice

On my diesel 85 K30 the sending unit ground wire passes through the frame right around the back of the cab and attached to a stud on the inside of the c-channel there. Probably anywhere you can ground it to the frame would be sufficient.
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Old 02-23-2024, 12:38 PM   #3
kwmech
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Re: 6.2 fuel sending unit advice

Looks like an optional power lead for an internal pump, but I would drill a small hole in that flat bracket and put an electrical eyelet on it, solder it, and bolt it on.
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Old 02-27-2024, 12:25 AM   #4
kennyw
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Re: 6.2 fuel sending unit advice

What year did you specify for the new sender? 82-83 had the water in fuel sender in the fuel tank when they used the spin on fuel filters and would account for the internal wire.
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Old 02-27-2024, 08:05 PM   #5
hatzie
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Re: 6.2 fuel sending unit advice

Quote:
Originally Posted by kennyw View Post
What year did you specify for the new sender? 82-83 had the water in fuel sender in the fuel tank when they used the spin on fuel filters and would account for the internal wire.
I thought some of them used the same box filter in the intake valley as the 350 Diesel.
I wondered what the reasoning for going to that leaky abomination of the Stanadyne 80 box filter.
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Old 02-27-2024, 09:16 PM   #6
kennyw
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Re: 6.2 fuel sending unit advice

Quote:
Originally Posted by hatzie View Post
I thought some of them used the same box filter in the intake valley as the 350 Diesel.
I wondered what the reasoning for going to that leaky abomination of the Stanadyne 80 box filter.
They used two spin on filters for 82-83. One on the firewall, one on the back of the intake.
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Old 02-28-2024, 09:15 AM   #7
hatzie
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Re: 6.2 fuel sending unit advice

Quote:
Originally Posted by kennyw View Post
They used two spin on filters for 82-83. One on the firewall, one on the back of the intake.
Spin on filters are much less problematic than those box filters.
My '80s VW diesels had spin on filters and they just worked.
The Stanadyne 80 was an obnoxious leaky abomination.
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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...Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.
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