6.2 fuel sending unit problems - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

andyh1956 · 04-13-2018, 10:35 AM

I found this in my CUCV manuals.
GM part # for Fuel, Tank Meter on M1008 is 25004137.
For the M1009 it is 25004140.
The units are different between the M1008 & M1009

**hatzie** · 04-13-2018, 09:55 PM

The M1009 is a Blazer chassis with the tank between the frame rails.
M1008 M1010 M1028 & M1030, I think I got em all, are pickups with saddle tanks.

andyh1956 · 04-15-2018, 10:48 AM

By looking at the illustrations, the M1009s have four outlets & M1008s have three. The center outlet on the M1008 hooks to a short piece of tubing that drops over to inside the frame & has a cap on it. They list this assy as a "Tank Drain".
I spose you are to hook a pump onto this & suck the tank out.
I'll look in my TMs for the procedure.
But in the short run it looks like a feature not needed for our purposes.

**hatzie** · 04-15-2018, 02:25 PM

You really only need vent, supply, and return for the diesels. The tank drain is superfluous.

GM stopped installing the tank drain in the Civvy rigs around 1984 or 1985 or so. Since the military spec for the trucks was based on an early 1984 chassis, and the military gets nervous about changes, they kept building them exactly the same til Uncle Sam stopped ordering them.

If it's stock pre mid-84 you'll find a valve somewhere around the spring hanger on the frame. It may actually be inside the spring hanger. The TM will probably tell you. You can get rid of this drain line unless you're going for exactly original.

andyh1956 · 04-15-2018, 03:07 PM

Quote:

Originally Posted by hatzie

You really only need vent, supply, and return for the diesels. The tank drain is superfluous.

GM stopped installing the tank drain in the Civvy rigs around 1984 or 1985 or so. Since the military spec for the trucks was based on an early 1984 chassis, and the military gets nervous about changes, they kept building them exactly the same til Uncle Sam stopped ordering them.

If it's stock pre mid-84 you'll find a valve somewhere around the spring hanger on the frame. It may actually be inside the spring hanger. The TM will probably tell you. You can get rid of this drain line unless you're going for exactly original.

"SuperWho"???

**hatzie** · 04-15-2018, 04:22 PM

superfluous
[soo-pur-floo-uh s]

adjective

1. being more than is sufficient or required; excessive.
2. unnecessary or needless.
3. Obsolete. possessing or spending more than enough or necessary; extravagant.

Ahh tends ta use them thar big words sometaahms.

andyh1956 · 04-16-2018, 12:00 AM

This forum is FULL of $10 words today!

barry1982 · 04-21-2018, 09:26 PM

I had a similar problem with a 6.2 after we changed out a leaking fuel tank. The truck would start, run for a few min., then stop. Ran perfect before we removed the tank, so I knew it was something we did. Pulled the tank off again, and turns out one of the short rubber hoses that go from the fuel line to gauge/sending unit got kinked while installing. Unkinked adjusted hose, reinstalled tank, ran like a dream.

04-13-2018, 10:35 AM	#26
andyh1956 Registered User Join Date: Mar 2010 Location: thomastown mississippi Posts: 1,261	Re: 6.2 fuel sending unit problems I found this in my CUCV manuals. GM part # for Fuel, Tank Meter on M1008 is 25004137. For the M1009 it is 25004140. The units are different between the M1008 & M1009

04-13-2018, 09:55 PM	#27
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,912	Re: 6.2 fuel sending unit problems The M1009 is a Blazer chassis with the tank between the frame rails. M1008 M1010 M1028 & M1030, I think I got em all, are pickups with saddle tanks. __________________ 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... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF 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.

04-15-2018, 10:48 AM	#28
andyh1956 Registered User Join Date: Mar 2010 Location: thomastown mississippi Posts: 1,261	Re: 6.2 fuel sending unit problems By looking at the illustrations, the M1009s have four outlets & M1008s have three. The center outlet on the M1008 hooks to a short piece of tubing that drops over to inside the frame & has a cap on it. They list this assy as a "Tank Drain". I spose you are to hook a pump onto this & suck the tank out. I'll look in my TMs for the procedure. But in the short run it looks like a feature not needed for our purposes.

04-15-2018, 02:25 PM	#29
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,912	Re: 6.2 fuel sending unit problems You really only need vent, supply, and return for the diesels. The tank drain is superfluous. GM stopped installing the tank drain in the Civvy rigs around 1984 or 1985 or so. Since the military spec for the trucks was based on an early 1984 chassis, and the military gets nervous about changes, they kept building them exactly the same til Uncle Sam stopped ordering them. If it's stock pre mid-84 you'll find a valve somewhere around the spring hanger on the frame. It may actually be inside the spring hanger. The TM will probably tell you. You can get rid of this drain line unless you're going for exactly original. __________________ 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... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF 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. Last edited by hatzie; 04-15-2018 at 02:33 PM.

04-15-2018, 04:22 PM	#31
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,912	Re: 6.2 fuel sending unit problems superfluous [soo-pur-floo-uh s] adjective 1. being more than is sufficient or required; excessive. 2. unnecessary or needless. 3. Obsolete. possessing or spending more than enough or necessary; extravagant. Ahh tends ta use them thar big words sometaahms. __________________ 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... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF 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.

04-16-2018, 12:00 AM	#32
andyh1956 Registered User Join Date: Mar 2010 Location: thomastown mississippi Posts: 1,261	Re: 6.2 fuel sending unit problems This forum is FULL of $10 words today!

04-21-2018, 09:26 PM	#33
barry1982 Registered User Join Date: Oct 2015 Location: Waskatenau, Alberta Posts: 259	Re: 6.2 fuel sending unit problems I had a similar problem with a 6.2 after we changed out a leaking fuel tank. The truck would start, run for a few min., then stop. Ran perfect before we removed the tank, so I knew it was something we did. Pulled the tank off again, and turns out one of the short rubber hoses that go from the fuel line to gauge/sending unit got kinked while installing. Unkinked adjusted hose, reinstalled tank, ran like a dream.



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