Another Suburban problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

skyhawk1 · 12-04-2002, 07:54 AM

I'm getting about 9 miles per gallon. It has 350 with 350 auto. Edlebrock 600 with electric choke.

Cheesewagon · 12-04-2002, 08:16 AM

Hi, well your doing about as good as I'm doing. I have the same engine trans-combo. There was thread on here about the Elebrock carbs needing only 5.5 lbs. fuel pressure. I believe my stock pump puts out about 9 lbs., so I'm going to try a holley fuel regulator. Did you upgrade to HEI? Believe me that really helped out with mine ( about 12 mpg highway). I'll talk to you latter, Tom.

da-burb · 12-04-2002, 09:09 AM

My burb does pretty much the same thing. When I got it many years ago, it did 16 mpg with the factory carb. It had a worn out throttle shaft so the idle varied 500+- rpm. I changed out the carb and it got 10 mpg. 2 years ago I rebuilt the engine, transmission, and had my mechanic rebuild the carb. On it's first long trip I averaged 14mpg. So I am on the right track.

I have the Edelbrock 1406 carb on my winter beater and I get 10mpg out of it too.

Either way, making a 2-3 ton brick move down the road and getting good gas milage are not usually synonomous.

12-04-2002, 07:54 AM	#1
skyhawk1 Registered User Join Date: Dec 2000 Location: Oceana WV USA Posts: 184	Another Suburban problem I'm getting about 9 miles per gallon. It has 350 with 350 auto. Edlebrock 600 with electric choke. __________________ "The World's a Mess"! 71 C-10 72 Suburban 2WD Oceana, West Virginia

12-04-2002, 08:16 AM	#2
Cheesewagon Senior Member Join Date: Jan 2002 Location: Perrysburg, Ohio, USA Posts: 409	Hi, well your doing about as good as I'm doing. I have the same engine trans-combo. There was thread on here about the Elebrock carbs needing only 5.5 lbs. fuel pressure. I believe my stock pump puts out about 9 lbs., so I'm going to try a holley fuel regulator. Did you upgrade to HEI? Believe me that really helped out with mine ( about 12 mpg highway). I'll talk to you latter, Tom. __________________ '91 suburban 350 TBI - R 700 4 new daily driver '72 Cheyenne Super 49,000miles 350/350 frame up resto w/ matching numbers.

12-04-2002, 09:09 AM	#3
da-burb "Ochre Ogre" Join Date: Apr 2000 Location: Springfield, MN Posts: 3,558	My burb does pretty much the same thing. When I got it many years ago, it did 16 mpg with the factory carb. It had a worn out throttle shaft so the idle varied 500+- rpm. I changed out the carb and it got 10 mpg. 2 years ago I rebuilt the engine, transmission, and had my mechanic rebuild the carb. On it's first long trip I averaged 14mpg. So I am on the right track. I have the Edelbrock 1406 carb on my winter beater and I get 10mpg out of it too. Either way, making a 2-3 ton brick move down the road and getting good gas milage are not usually synonomous. __________________ Bowtie Truck Stop Inc. Mid-West GM Truck Restoration Parts Supplier Your Key Parts, Auto Metal Direct, Dynacorn, and Goodmark dealer. like us @ www.facebook.com/BowtieTruckStop 1971 C-10 Suburban (Ochre) 1971 K-10 Suburban (Ochre) 1972 C-10 Suburban (Ochre) 1972 K-20 Suburban (Yellow- that just aint right!) Springfield, Minnesota 56087

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