GM350CID/290HP question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

killer_mike · 09-26-2008, 04:34 PM

I was just wondering if anyone that has a 350/290 is on the same situation. You turn on the truck, but u have to give it a little gas, and it starts right away, almost instantaneous, but if u dont give it gas on the first atempt, it takes a while to start and then u have to kinda like prime the carb with the throttle.

I bought a regular mechanical fuel pump, like the Carter design, i have a GM Racing Mech pump but i cant put it in, i will have to grind the right side engine cross member so the fitting can go in there. Does this starting problem is due to the pump not having enough PSI for 350 engines?

Thanks.

lowriden58 · 09-26-2008, 04:45 PM

im pretty sure thats any carb'd v8... my built 355 with a 750dp does it when its cold

Sinister · 09-26-2008, 05:26 PM

Quote:

Originally Posted by lowriden58

im pretty sure thats any carb'd v8...

PanelDeland · 09-26-2008, 05:32 PM

All carbed engines do this to some extent.The fuel in the carb has to be "Squirted" into the "Venturi's" to atomize with air and become volatile.Standard procedure for new cars in the 50-60's were to pump the pedal to the floor one time,release,then crank.This allowed the accelerator pump to squirt fuel into the engine.It later "Set" the automatic choke also.All of this is done by the electronics on EFI and so no "pump" is required.

70rs/ss · 09-26-2008, 06:06 PM

Yeah, more a carb issue than fuel pump, but doesn't mean the carb is "BAD" just needs a pump of fuel to get er going!

**uncle** · 09-26-2008, 07:42 PM

What carb. do you have?

killer_mike · 09-28-2008, 12:07 AM

Edelbrock Thunder AVS Carb model 1805

**Boog** · 09-28-2008, 06:57 AM

That's the deal. You have to give it a little bit of pedal to start it off. Sounds kinda antiquated doesn't it? It's not necessary with efi. We've had fuel injected engines now for a long time and I know a few people who still mash the pedal upon startup just out of old habit. Some will even pump it several times before turning the key...

matthufham · 09-28-2008, 01:39 PM

consider the lawnmower or weed eater, got to prime it a bit.

killer_mike · 09-28-2008, 08:12 PM

Thanks for the tips, this is my first classic truck and i never had a carbed vehicle, so that was kinda scaring me.

09-26-2008, 04:34 PM	#1
killer_mike Big Red & Mister Blue... Join Date: Jan 2008 Location: Pat, NJ Posts: 107	GM350CID/290HP question I was just wondering if anyone that has a 350/290 is on the same situation. You turn on the truck, but u have to give it a little gas, and it starts right away, almost instantaneous, but if u dont give it gas on the first atempt, it takes a while to start and then u have to kinda like prime the carb with the throttle. I bought a regular mechanical fuel pump, like the Carter design, i have a GM Racing Mech pump but i cant put it in, i will have to grind the right side engine cross member so the fitting can go in there. Does this starting problem is due to the pump not having enough PSI for 350 engines? Thanks. __________________ K10 1967, SM420 & Rockwell T221 C1500 1991, 305 CID, Ext Cab, Full Size bed, everything original except air cleaner.

09-26-2008, 04:45 PM	#2
lowriden58 Registered User Join Date: Jan 2008 Location: Chesapeake Beach, MD Posts: 812	Re: GM350CID/290HP question im pretty sure thats any carb'd v8... my built 355 with a 750dp does it when its cold __________________ 71 cheyenne lwb 300rwhp best 1/4 time so far 12.8 @103 http://i195.photobucket.com/albums/z...en58/001-2.jpg

09-26-2008, 05:32 PM	#4
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,992	Re: GM350CID/290HP question All carbed engines do this to some extent.The fuel in the carb has to be "Squirted" into the "Venturi's" to atomize with air and become volatile.Standard procedure for new cars in the 50-60's were to pump the pedal to the floor one time,release,then crank.This allowed the accelerator pump to squirt fuel into the engine.It later "Set" the automatic choke also.All of this is done by the electronics on EFI and so no "pump" is required. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" Last edited by PanelDeland; 09-26-2008 at 05:33 PM.

09-26-2008, 06:06 PM	#5
70rs/ss Registered User Join Date: Dec 2004 Location: Northern AZ Posts: 7,270	Re: GM350CID/290HP question Yeah, more a carb issue than fuel pump, but doesn't mean the carb is "BAD" just needs a pump of fuel to get er going!

09-26-2008, 07:42 PM	#6
uncle Senior Member Join Date: Aug 2003 Location: Conyers,Ga. Posts: 7,289	Re: GM350CID/290HP question What carb. do you have?

09-28-2008, 12:07 AM	#7
killer_mike Big Red & Mister Blue... Join Date: Jan 2008 Location: Pat, NJ Posts: 107	Re: GM350CID/290HP question Edelbrock Thunder AVS Carb model 1805 __________________ K10 1967, SM420 & Rockwell T221 C1500 1991, 305 CID, Ext Cab, Full Size bed, everything original except air cleaner.

09-28-2008, 06:57 AM	#8
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,661	Re: GM350CID/290HP question That's the deal. You have to give it a little bit of pedal to start it off. Sounds kinda antiquated doesn't it? It's not necessary with efi. We've had fuel injected engines now for a long time and I know a few people who still mash the pedal upon startup just out of old habit. Some will even pump it several times before turning the key... __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

09-28-2008, 01:39 PM	#9
matthufham Registered User Join Date: Feb 2005 Location: Carl Junction, Missouri Posts: 2,061	Re: GM350CID/290HP question consider the lawnmower or weed eater, got to prime it a bit.

09-28-2008, 08:12 PM	#10
killer_mike Big Red & Mister Blue... Join Date: Jan 2008 Location: Pat, NJ Posts: 107	Re: GM350CID/290HP question Thanks for the tips, this is my first classic truck and i never had a carbed vehicle, so that was kinda scaring me. __________________ K10 1967, SM420 & Rockwell T221 C1500 1991, 305 CID, Ext Cab, Full Size bed, everything original except air cleaner.



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