Need help asap!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

kurama49 · 04-14-2012, 08:45 PM

I just finished putting on my new carbourator on my 75 gmc, but I now have a HUGE problem!! when I crank the truck over, just before it catches the carb backfires, then stays on fire for a few seconds! We reacted quickly and put the fire out with water.. no one was hurt thankfully, but could it mabey be the vacuum lines? my timing, or fouled plugs?

bilfman · 04-14-2012, 08:49 PM

Did you mess with the distributor or timing?

kurama49 · 04-14-2012, 08:50 PM

Quote:

Originally Posted by bilfman

Did you mess with the distributor or timing?

Yes, a tiny bit.. :x would this mean its too advanced? would I get the same thing if I retarted it some? I'm actually kind of scared to try and start it now, since this is my first time doing anything like this..

bilfman · 04-14-2012, 08:58 PM

If you pulled the distributor it looks like it might be turned 180 degrees.

kurama49 · 04-14-2012, 08:59 PM

Quote:

Originally Posted by bilfman

If you pulled the distributor it looks like it might be turned 180 degrees.

I didnt pull it, just rotated it a little bit towards the passenger side of the truck

bilfman · 04-14-2012, 09:07 PM

If you moved it towards the pass side the timing will be retarded. This is an easy fix, if you know timing. If not there is a lot to explain. Try turning it back towards the drivers side and see if it will start. Don't turn it over forever, if it doesn't start keep going back until it does. If it doesnt, there is more work to do.........

joe231 · 04-14-2012, 10:36 PM

Don't ever throw water on a gas fire.
It can spread the gas and cause a big fire.
Posted via Mobile Device

jhngardner367 · 04-15-2012, 12:46 AM

That big vacuum fitting,under the fuel inlet,at the front of the carb should have a hose to connect it to the PCV valve,also,or you'll lose engine vacuum.

kurama49 · 04-15-2012, 05:59 PM

I fixed where the vacuum hose goes, Truck was running beautiful... for 15 minutes..

I went to pull out onto the road, it sputtered, so i backed back into the driveway, shut it off. then when i tryed to crank it over again, it wouldent catch.. it did, but then i died. I put some gas down the carb and it ran again!, but white smoke is coming out now.. and it also died again. After a while of waiting, i tryed it again, but it wouldent go until i held my foot to the floor, and even with it to the floor it just barely idled... Also, I noticed some Anti-freeze where the rad connects to the intake manifold.. is this bad?

04-14-2012, 08:45 PM	#1
kurama49 Registered User Join Date: Mar 2012 Location: Cape breton Nova scotia Posts: 28	Need help asap!!! I just finished putting on my new carbourator on my 75 gmc, but I now have a HUGE problem!! when I crank the truck over, just before it catches the carb backfires, then stays on fire for a few seconds! We reacted quickly and put the fire out with water.. no one was hurt thankfully, but could it mabey be the vacuum lines? my timing, or fouled plugs?

04-14-2012, 08:49 PM	#2
bilfman Registered User Join Date: Dec 2011 Location: Regina, SK, Canada Posts: 622	Re: Need help asap!!! Did you mess with the distributor or timing? __________________ 1979 Chevy Dually Crew 4X4 454, D60 Tru-trac, D70 Detroit Locker, 3.73, 4L80E/NP205 1971 GMC 3/4 Ton 4X4

04-14-2012, 08:58 PM	#4
bilfman Registered User Join Date: Dec 2011 Location: Regina, SK, Canada Posts: 622	Re: Need help asap!!! If you pulled the distributor it looks like it might be turned 180 degrees. __________________ 1979 Chevy Dually Crew 4X4 454, D60 Tru-trac, D70 Detroit Locker, 3.73, 4L80E/NP205 1971 GMC 3/4 Ton 4X4

04-14-2012, 09:07 PM	#6
bilfman Registered User Join Date: Dec 2011 Location: Regina, SK, Canada Posts: 622	Re: Need help asap!!! If you moved it towards the pass side the timing will be retarded. This is an easy fix, if you know timing. If not there is a lot to explain. Try turning it back towards the drivers side and see if it will start. Don't turn it over forever, if it doesn't start keep going back until it does. If it doesnt, there is more work to do......... __________________ 1979 Chevy Dually Crew 4X4 454, D60 Tru-trac, D70 Detroit Locker, 3.73, 4L80E/NP205 1971 GMC 3/4 Ton 4X4

04-14-2012, 10:36 PM	#7
joe231 Registered User Join Date: Dec 2007 Location: Palmer, Alaska Posts: 13,821	Re: Need help asap!!! Don't ever throw water on a gas fire. It can spread the gas and cause a big fire. Posted via Mobile Device __________________ *CHEVY ONLY*

04-15-2012, 12:46 AM	#8
jhngardner367 Registered User Join Date: Feb 2012 Location: Austin, Arkansas Posts: 248	Re: Need help asap!!! That big vacuum fitting,under the fuel inlet,at the front of the carb should have a hose to connect it to the PCV valve,also,or you'll lose engine vacuum. __________________ Always expect the unexpected,....but don't expect the unexpected to be the unexpected you expect ! I'm busier than a one-legged cat,in a sandbox! Veteran..and proud ! I can't fix what ain't broke....you want I should break it?

04-15-2012, 05:59 PM	#9
kurama49 Registered User Join Date: Mar 2012 Location: Cape breton Nova scotia Posts: 28	Re: Need help asap!!! I fixed where the vacuum hose goes, Truck was running beautiful... for 15 minutes.. I went to pull out onto the road, it sputtered, so i backed back into the driveway, shut it off. then when i tryed to crank it over again, it wouldent catch.. it did, but then i died. I put some gas down the carb and it ran again!, but white smoke is coming out now.. and it also died again. After a while of waiting, i tryed it again, but it wouldent go until i held my foot to the floor, and even with it to the floor it just barely idled... Also, I noticed some Anti-freeze where the rad connects to the intake manifold.. is this bad?



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