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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: mattroxhere on December 20, 2013, 08:30:07 pm

Title: Getting Worse Gas Mileage Now
Post by: mattroxhere on December 20, 2013, 08:30:07 pm

I have an 85 GMC with a crate 350 and crate 350 turbo trans. It has an Edlebrock 680 carb, 3.42 gears and 3/4 ton running gears. I use to get 9-10 mpg now all of a sudden I'm getting 4-5mpg. What happened or what can i do to get better gas mileage or at least back to what i was getting? Thanks for reading, any help would be much appreciated, its a daily driver.

Thanks,
Matt

Title: Re: Getting Worse Gas Mileage Now
Post by: Boone83K10 on December 20, 2013, 09:21:29 pm

Lift up your right foot.

 

Title: Re: Getting Worse Gas Mileage Now
Post by: Captkaos on December 24, 2013, 11:32:55 am

What changed?

Title: Re: Getting Worse Gas Mileage Now
Post by: dvdswan on December 24, 2013, 01:03:02 pm

when was the last time you did a tune up?  do you still have all the emission junk on the engine?  did you fill up at an unknown gas station or is this over several fillups?

Title: Re: Getting Worse Gas Mileage Now
Post by: mattroxhere on December 26, 2013, 09:29:24 am

I thought it might be my timing and plugs but that didn't help now its flooding out randomly and i got gas sitting in my carb.

Title: Re: Getting Worse Gas Mileage Now
Post by: bake74 on December 26, 2013, 02:36:51 pm

Quote from: mattroxhere on December 26, 2013, 09:29:24 am

I thought it might be my timing and plugs but that didn't help now its flooding out randomly and i got gas sitting in my carb.

     You might have got some bad gas, sounds like you need to tune up your carb.

Title: Re: Getting Worse Gas Mileage Now
Post by: mattroxhere on December 27, 2013, 08:58:06 am

Ya I'm probably gonna get it rebuild thanks for the help guys.   :D