no gas to the carb in my 70 c-30??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

motornutz · 10-20-2008, 12:21 AM

on my c-30 i had a 2bbl that never quite ran right so i rounded up some parts from the shop and came up with my holley intake and a edelbrock 1407 carb (750cfm?) i also put in a hei ignition. i got her all back together and it started hard (had to crank forever). but when i got it running it was sputtering and popping. the problem is after running for about 5 minutes the clear gas filter was almost completely empty and she died. the previous owner ran 3/8 rubber from tank to pump. do you think this could be collapsing and cutting off flow? should i plan on putting in steel lines most of the way to the pump. i checked and have no obstructions in the lines or filter. i had to turn the fuel mitxture screws out like 4 turns, isn't this too much? i took the fuel pump off and it seems to spray out fuel fine. the engine is a stock 350 w/ a man 4spd. does an edelbrock 750 seem a bit big? i have an older q-jet from a 305 would it make more sense to put this on instead? sorry for the long post just looking for a bit of help on this one

Steelawork'n · 10-20-2008, 12:46 AM

If you can do stainless steel tubing, do it. It will save you a lot of grief in the long run. Some mechanical fuel pumps look ok but have bad seals. Put the engine under a load while someone observes the pump. If the inside seals are broken it will spray gas out the weep hole. An easier and safer method would be to put a pressure guage on it. (I like the backwoods way myself)

I'm not sure about the 750 carb. I think I would go down a few to a 650 or something.

Never hurts to recheck the firing order too.

*chevy29267truck* · 10-20-2008, 01:05 AM

What part of MI are you in i got a friend that lives up there all works on cars&trucks

motornutz · 10-20-2008, 01:27 AM

i live near croswell (thumb). i rechecked the firing order, loks good too. any other ideas?

cdowns · 10-20-2008, 06:24 AM

get rid of the rubber fuel line //could be the in tank filter/fuel strainer attached to the fuel pickup is clogged with 40years of rust varnish sludge and other crap,might be time to have the tank cleaned

motornutz · 10-20-2008, 09:13 AM

when i took the gas line off the down tube from the tank it came rushing out, no obstructions.

**special-K** · 10-20-2008, 10:15 AM

I`d go ahead and run new metal line.You say you took the outlet line off the fuel pump and it was gushing?

motornutz · 10-20-2008, 10:43 PM

no, i took the rubber line off the tanks down tube and gas came pouring out of there? i think ill start with the steel fuel line and use fuel injection hose at the pump inlet and tank outlet

*chevy29267truck* · 10-21-2008, 10:49 PM

i am pm you a # number too call

10-20-2008, 12:21 AM	#1
motornutz Registered User Join Date: Oct 2004 Location: michigan Posts: 45	no gas to the carb in my 70 c-30??? on my c-30 i had a 2bbl that never quite ran right so i rounded up some parts from the shop and came up with my holley intake and a edelbrock 1407 carb (750cfm?) i also put in a hei ignition. i got her all back together and it started hard (had to crank forever). but when i got it running it was sputtering and popping. the problem is after running for about 5 minutes the clear gas filter was almost completely empty and she died. the previous owner ran 3/8 rubber from tank to pump. do you think this could be collapsing and cutting off flow? should i plan on putting in steel lines most of the way to the pump. i checked and have no obstructions in the lines or filter. i had to turn the fuel mitxture screws out like 4 turns, isn't this too much? i took the fuel pump off and it seems to spray out fuel fine. the engine is a stock 350 w/ a man 4spd. does an edelbrock 750 seem a bit big? i have an older q-jet from a 305 would it make more sense to put this on instead? sorry for the long post just looking for a bit of help on this one

10-20-2008, 12:46 AM	#2
Steelawork'n Just hang'n around Join Date: Nov 2005 Location: Camano Island WA Posts: 248	Re: no gas to the carb in my 70 c-30??? If you can do stainless steel tubing, do it. It will save you a lot of grief in the long run. Some mechanical fuel pumps look ok but have bad seals. Put the engine under a load while someone observes the pump. If the inside seals are broken it will spray gas out the weep hole. An easier and safer method would be to put a pressure guage on it. (I like the backwoods way myself) I'm not sure about the 750 carb. I think I would go down a few to a 650 or something. Never hurts to recheck the firing order too. __________________ Driving a '68 Chevy C20 and a '93 Astro Van. Lots and lots of mileage that I deduct each year. Last edited by Steelawork'n; 10-20-2008 at 12:46 AM.

10-20-2008, 01:05 AM	#3
chevy29267truck Account Suspended Join Date: Sep 2008 Location: Alva Florida Posts: 668	Re: no gas to the carb in my 70 c-30??? What part of MI are you in i got a friend that lives up there all works on cars&trucks

10-20-2008, 01:27 AM	#4
motornutz Registered User Join Date: Oct 2004 Location: michigan Posts: 45	Re: no gas to the carb in my 70 c-30??? i live near croswell (thumb). i rechecked the firing order, loks good too. any other ideas?

10-20-2008, 06:24 AM	#5
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: no gas to the carb in my 70 c-30??? get rid of the rubber fuel line //could be the in tank filter/fuel strainer attached to the fuel pickup is clogged with 40years of rust varnish sludge and other crap,might be time to have the tank cleaned __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

10-20-2008, 09:13 AM	#6
motornutz Registered User Join Date: Oct 2004 Location: michigan Posts: 45	Re: no gas to the carb in my 70 c-30??? when i took the gas line off the down tube from the tank it came rushing out, no obstructions.

10-20-2008, 10:15 AM	#7
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: no gas to the carb in my 70 c-30??? I`d go ahead and run new metal line.You say you took the outlet line off the fuel pump and it was gushing? __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

10-20-2008, 10:43 PM	#8
motornutz Registered User Join Date: Oct 2004 Location: michigan Posts: 45	Re: no gas to the carb in my 70 c-30??? no, i took the rubber line off the tanks down tube and gas came pouring out of there? i think ill start with the steel fuel line and use fuel injection hose at the pump inlet and tank outlet

10-21-2008, 10:49 PM	#9
chevy29267truck Account Suspended Join Date: Sep 2008 Location: Alva Florida Posts: 668	Re: no gas to the carb in my 70 c-30??? i am pm you a # number too call



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.