1981 GMC sierra 350 DIESEL - The 1947 - Present Chevrolet & GMC Truck Message Board Network

hughnews1 · 07-18-2004, 08:09 PM

help i just bot a 1981 GMC high Sierra LB with 350 Diesel .. i have a new fuel filter .. in the box .. where does it go ? last time on the road wuz about 1992 .. so New filter needed.... anybody ?

SanitysBane · 07-19-2004, 12:48 AM

it probally wouldn't hurt to replace the filter, about all i know about diesels is that diesel and water, isn't a good combination, i have no clue about the filter, but congrats on the new truck!

RockHQ · 07-19-2004, 12:06 PM

Finally someone from the states who's still got a 350D(X). You've got quite a rare combination there, finding a 78-81 pickup that still has a 350 Olds diesel is not a common thing, never was (low production numbers) and especially after 23+ years. Most of those engines grenaded before their 10th birthday.

Anyway, what kind of a filter is it? I can't remember what year GM switched over to the square box style filter, but you probably have a round canister type filter (looks like an oil filter), check behind the intake manifold.

ElGracho · 07-19-2004, 05:04 PM

84 was the first year of the square fuel filter on the diesels.

hughnews1 · 07-19-2004, 06:47 PM

i bot a new filter .. and its a square one.. I saved the rep... thanks I will take a look... Hugh

arveetek · 07-21-2004, 10:10 PM

The 350 diesels used a small rectangular filter mounted in the rear of the intake manifold, behind the injection pump. The fuel lines screwed into and out of the filter, kind of a pain to change. The 6.2L was introduced in 1982, and they had twin, spin-on filters, a large primary on the firewall, and smaller secondary on the back of the intake manifold. In 84, they combined both filters into a large, rectangular filter mounted on the firewall. I can't remember if the 350 diesel trucks had a dual filter system or not.

Good luck! Let us know if you get it running! And like Rock said, that's a rare truck. Most of those trucks had the diesels ripped out and an Olds 350 gasser put back in its place. Do us a favor and keep that diesel in there!

Casey

hughnews1 · 07-21-2004, 10:14 PM

yup thats the filter i got .. working on this coming weekend.. thanks casey

07-18-2004, 08:09 PM	#1
hughnews1 Registered User Join Date: Apr 2002 Location: Hudson FL gulf coast Posts: 624	1981 GMC sierra 350 DIESEL help i just bot a 1981 GMC high Sierra LB with 350 Diesel .. i have a new fuel filter .. in the box .. where does it go ? last time on the road wuz about 1992 .. so New filter needed.... anybody ?

07-19-2004, 12:48 AM	#2
SanitysBane Registered User Join Date: May 2004 Location: Lubbock, Texas Posts: 2,121	it probally wouldn't hurt to replace the filter, about all i know about diesels is that diesel and water, isn't a good combination, i have no clue about the filter, but congrats on the new truck! __________________ '96 Nissan Pathfinder '02 Firebird Trans Am. '88 K5 Blazer

07-19-2004, 12:06 PM	#3
RockHQ ROCKET POWER! Join Date: Feb 2003 Location: Finland, Europe Posts: 509	Finally someone from the states who's still got a 350D(X). You've got quite a rare combination there, finding a 78-81 pickup that still has a 350 Olds diesel is not a common thing, never was (low production numbers) and especially after 23+ years. Most of those engines grenaded before their 10th birthday. Anyway, what kind of a filter is it? I can't remember what year GM switched over to the square box style filter, but you probably have a round canister type filter (looks like an oil filter), check behind the intake manifold. __________________ What did i do last nite? I had a wonderful time, That's what they tell me What did i do last nite? 1979 C-10 shortfleet: Olds 350, Th400, 12 bolt Current project: 1969 Olds 455 W-30, needing a rebuild

07-19-2004, 05:04 PM	#4
ElGracho Gentleman Jim Driver Join Date: Nov 2002 Location: Poulsbo, WA Posts: 1,550	84 was the first year of the square fuel filter on the diesels. __________________ Joe '75 GMC Gentleman Jim '84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig lighter) '85 Chev C10 Short Wide - Super plain Vortec 4.8 4L60E trans also: '81 K30, '83 C30 Crew Dually, '84 M1028 CUCV, '85 M1009 CUCV, another '85 C10 SWB, '89 R3500 Flatbed

07-21-2004, 10:10 PM	#6
arveetek Ultimate Diesel Dude Join Date: Oct 2002 Location: Southwest Missouri Posts: 328	The 350 diesels used a small rectangular filter mounted in the rear of the intake manifold, behind the injection pump. The fuel lines screwed into and out of the filter, kind of a pain to change. The 6.2L was introduced in 1982, and they had twin, spin-on filters, a large primary on the firewall, and smaller secondary on the back of the intake manifold. In 84, they combined both filters into a large, rectangular filter mounted on the firewall. I can't remember if the 350 diesel trucks had a dual filter system or not. Good luck! Let us know if you get it running! And like Rock said, that's a rare truck. Most of those trucks had the diesels ripped out and an Olds 350 gasser put back in its place. Do us a favor and keep that diesel in there! Casey __________________ Project truck: '81 C/20 converted to 6.2L TURBO DIESEL bored .040", gear drive, 6.5L injectors/pump, custom pistons, custom 4" exhaust, 700R4, 4.10's Daily Driver: '95 K1500 Tahoe, 6.5L TURBO DIESEL, NP241, 4L80E, 3.42's

07-19-2004, 06:47 PM	#5
hughnews1 Registered User Join Date: Apr 2002 Location: Hudson FL gulf coast Posts: 624	i bot a new filter .. and its a square one.. I saved the rep... thanks I will take a look... Hugh

07-21-2004, 10:14 PM	#7
hughnews1 Registered User Join Date: Apr 2002 Location: Hudson FL gulf coast Posts: 624	yup thats the filter i got .. working on this coming weekend.. thanks casey

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