Inline 250 Six-Cylinder Problem? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BKWest · 09-30-2004, 11:27 AM

I have a 250 Inline in my 1970 Stepside. It has a one barrel carb. When I give it gas it will cut out for a second and then accelerate. I have also heard a small backfire once or twice when it does this also....Any solutions for this? Thanks for any help....

Fred T · 09-30-2004, 11:41 AM

Sounds like the accelerator pump in the carb is worn out. That's usually the reason for the delay. Never had one backfire because of that, I would guess you have an ignition problem also.

**Palf70Step** · 09-30-2004, 01:13 PM

Like Fred said, problably the main problem is accelerator pump. Rebuild kits are cheap and they are a very simple carb. Heck, I did one and it worked afterwords too!!! I'd also add that you may have a timing issue, but I would strighten out the carb first then, tune/time it good.

BKWest · 09-30-2004, 03:09 PM

About a month ago I had started it after it had sit awhile...When it fired up it ran bad and fuel was pouring out of the carb to the ground....I just shut it down and tapped on the carb a few times with a small hammer and it was fixed....Now it does the sputter and go thing....I will try the carb rebuild...Thanks...Brad

09-30-2004, 11:27 AM	#1
BKWest Registered User Join Date: Sep 2003 Location: Rapid City, SD Posts: 31	Inline 250 Six-Cylinder Problem? I have a 250 Inline in my 1970 Stepside. It has a one barrel carb. When I give it gas it will cut out for a second and then accelerate. I have also heard a small backfire once or twice when it does this also....Any solutions for this? Thanks for any help.... __________________ 70 CHEVY STEPSIDE Last edited by BKWest; 09-30-2004 at 11:30 AM.

09-30-2004, 11:41 AM	#2
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	Sounds like the accelerator pump in the carb is worn out. That's usually the reason for the delay. Never had one backfire because of that, I would guess you have an ignition problem also. __________________ Fred There is no such thing as too much cam...just not enough engine.

09-30-2004, 01:13 PM	#3
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,083	Like Fred said, problably the main problem is accelerator pump. Rebuild kits are cheap and they are a very simple carb. Heck, I did one and it worked afterwords too!!! I'd also add that you may have a timing issue, but I would strighten out the carb first then, tune/time it good. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

09-30-2004, 03:09 PM	#4
BKWest Registered User Join Date: Sep 2003 Location: Rapid City, SD Posts: 31	I will try to rebeuild the carb..Also.... About a month ago I had started it after it had sit awhile...When it fired up it ran bad and fuel was pouring out of the carb to the ground....I just shut it down and tapped on the carb a few times with a small hammer and it was fixed....Now it does the sputter and go thing....I will try the carb rebuild...Thanks...Brad __________________ 70 CHEVY STEPSIDE

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