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09-23-2014, 03:01 PM
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#1 |
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Registered User
Join Date: Sep 2014
Location: Modesto California
Posts: 16
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Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
Like I said I'm new and I'm sure I'm gunna need some help and advice here and there. I picked up a 1978 GMC sierra grande this past weekend. Its my dd, she's not pretty but I love her. Lots of work to come. She's missing a gas tank on the right side and missing what I'm assuming is the heater core. I'll post some pics when I get home.
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09-23-2014, 03:33 PM
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#2 | |
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Registered User
 
Join Date: Oct 2010
Location: Town of Summit, WI
Posts: 322
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
Quote:
Show us what it looks like, always nice to see a new truck.
__________________
2017 Silverado LTZ 6.2 1984 Scottsdale K10 - 468 700r 4x4 lwb 1978 GMC Sierra Grande K15 350 Soond to be 406 th350 4x4 swb 1968 GMC 20 305 V6 good ole wood hauler.  Good Fences make good neighbors Last edited by parrisc19844x4_468; 09-23-2014 at 03:34 PM. Reason: add comment |
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09-23-2014, 03:59 PM
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#3 |
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Registered User
Join Date: Sep 2014
Location: Modesto California
Posts: 16
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
I won't be able to put up pictures until I'm off work late tonight but I'll make that my first order of business when I get home. Even before my scotch. Its been bogging out on me and not starting in the morning. I replaced the filters and cleaned the carb so I think its my pump or the line somewhere. Once it bogs it won't start without starter fluid. It'll start to bog when I'm driving and if I don't give it a fair amount of pedal it dies. Any ideas? Also is there any known problems with the gauges system? My temp gauge barely moves even after I've been during all day. Sorry to bomb you guys with questions all at once.
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09-23-2014, 05:00 PM
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#4 |
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78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
Hi welcome
Is the carb stock? any gas filters to replace? any vac lines off the carb? any background on it?
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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09-25-2014, 09:09 PM
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#5 |
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Registered User
Join Date: Sep 2014
Location: Modesto California
Posts: 16
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
Heres some pics of the body.
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09-25-2014, 09:11 PM
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#6 |
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Registered User
Join Date: Sep 2014
Location: Modesto California
Posts: 16
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
I'm gunna throw an in line filter in later and run it to see if I'm getting too much air. Should let me know if its a vaccum problem. its a stock carb too btw.
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09-25-2014, 09:13 PM
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#7 |
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Registered User
Join Date: Aug 2014
Location: Pittsburgh, PA
Posts: 627
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
You probably just need a new temp sensor. It is located on the drivers side head. Mine did that not to long ago.
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09-25-2014, 09:15 PM
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#8 | |
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Registered User
Join Date: Sep 2014
Location: Modesto California
Posts: 16
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
Quote:
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09-25-2014, 09:47 PM
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#9 | |
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Registered User
Join Date: Aug 2014
Location: Pittsburgh, PA
Posts: 627
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
Quote:
Ok I read over it again. I would start with a new fuel pump first. It sounds like it is starving itself for gas. If that doesn't work then check the float level and the needle and seat in the carb. Also make sire none of your fuel lines are kinked or cracked and seeping out gas. |
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09-26-2014, 01:49 AM
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#10 |
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Registered User
Join Date: Sep 2014
Location: Modesto California
Posts: 16
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
I had figured I would try a pump first thanks for the second opinion. I'm gunna pick one up tomorrow morning. I'll let you know how it goes.
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09-30-2014, 11:50 PM
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#11 |
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Registered User
Join Date: Sep 2014
Location: Modesto California
Posts: 16
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
Well i swapped the fuel pump and it shows no difference. Tomorrow I'm going to rebuild the carb. I have no experience with carbs so do you guys have any tips or links to somewhere that can help. Its the 5.7 v8 4bbl . Do you guys think a bad sending unit could make me bog as I described above? It seems to be dying a lot more frequently now too .
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10-01-2014, 12:03 AM
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#12 |
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Registered User
Join Date: Jul 2013
Location: So Cal
Posts: 292
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
Does it bog when the air cleaner is on as well? How many tanks of gas have you gone through already?
__________________
1978 C-10 Custom Deluxe | I6 250 | SWB | Stepside |
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10-01-2014, 12:06 AM
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#13 |
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Registered User
Join Date: Sep 2014
Location: Modesto California
Posts: 16
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
Maybe 2 and a half tanks. Haven't tried without the air cleaner . sorry if that's a rookie mistake I'm new to this.
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10-01-2014, 12:09 AM
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#14 |
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Registered User
Join Date: Jul 2013
Location: So Cal
Posts: 292
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
Chances are the air cleaner is fine. It's just a matter of narrowing down the problem. Any leaking near the new fuel pump?
__________________
1978 C-10 Custom Deluxe | I6 250 | SWB | Stepside |
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10-01-2014, 12:11 AM
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#15 |
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Registered User
Join Date: Sep 2014
Location: Modesto California
Posts: 16
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
Nope no leaking and I made sure the pin was retracted when I installed it
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10-01-2014, 12:55 AM
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#16 |
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Registered User
Join Date: Sep 2014
Location: Modesto California
Posts: 16
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
No leaking and I installed the fuel pump right. I made sure the pin was retracted.
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10-01-2014, 02:51 AM
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#17 |
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Registered User
Join Date: Feb 2007
Location: Laughlin,Nv
Posts: 141
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
Take an empty @ dry a/f or oil jug at least a gallon , fill it with gas , cut a hole in cap big enough for 3/8 fuel line put a hose in jug @ hook other side to fuel pump inlet be sure @ tie jug to batt box or the fan or1 of the pulleys might rub on it . If bog is gone problem is between pump @ tank
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10-01-2014, 08:20 PM
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#18 |
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Registered User
Join Date: Jul 2013
Location: So Cal
Posts: 292
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
Any update and welcome to the forum! Sorry I didn't mention that before. I'm new to learning on fixing these trucks too. But ask your questions, these guys on this forum are extremely helpful!
__________________
1978 C-10 Custom Deluxe | I6 250 | SWB | Stepside |
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10-01-2014, 08:36 PM
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#19 |
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Registered User
Join Date: Sep 2014
Location: Modesto California
Posts: 16
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
Just got off work , taking the carb off now after I rebuild it I'll check out the fuel system
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10-03-2014, 07:55 AM
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#20 |
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Registered User
Join Date: Jul 2013
Location: So Cal
Posts: 292
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
Props for rebuilding the carb yourself! Any luck?
__________________
1978 C-10 Custom Deluxe | I6 250 | SWB | Stepside |
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10-04-2014, 10:43 PM
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#21 |
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Registered User
Join Date: Jul 2012
Location: Central Oklahoma
Posts: 147
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
First thing I would do. Get a Fan shroud on that thing!! That fan is not effective without a shroud.
It's also an extreme safety hazard.
__________________
"Sucks to be you" Suxtobu65 
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10-04-2014, 11:45 PM
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#22 |
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Registered User
Join Date: Jun 2007
Location: Penticton BC Canada
Posts: 84
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
Welcome, and that looks like a solid truck to start with. Appears it came with a couple spare thumbs too, good for when you bash yours while working on it.
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86 Burb, 5/7 drop, 18" rims, big stereo, work in progress, as well as daily driver. 86 Short box just starting the build. 86 GMC 1500 2wd, ugly blue farm looking truck with a mild 454... More to come! 98 Cheyenne Ext cab short box 2wd. Driver and maybe future project. |
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10-08-2014, 10:19 PM
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#23 |
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Registered User
Join Date: Sep 2014
Location: Modesto California
Posts: 16
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
Update time! I did the carb and it began a whole new set of problems. I was soaking it and ran to go pick up the offspring from school and I had a buddy keeping an eye on things and he pulled the air mixture screws....
 Such a pain in the ass. Now im trying to find a way to get to the bolts while the truck is running to set them the right way. Also as im doing this I look down to find that my fuel pump that I recently replaced is leaking now X( So im calling it a night and going back at it tomorrow. Also I am gunna throw a shroud on the fan soon.
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10-08-2014, 10:20 PM
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#24 |
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Registered User
Join Date: Sep 2014
Location: Modesto California
Posts: 16
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
Im getting a LOT of smoke now and a little bit of back fire.
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10-09-2014, 11:40 AM
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#25 |
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Registered User
Join Date: Jul 2013
Location: So Cal
Posts: 292
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Re: Hello everyone I'm new around here, just picked up a 78 gmc sierra grande
All the smoke and back fire is from the carb rebuild? Hmm. Where is the smoke coming from? Exhaust or near intake?
__________________
1978 C-10 Custom Deluxe | I6 250 | SWB | Stepside |
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