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  #11  
Old 03-25-2004, 06:10 PM
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Eric 1 Eric 1 is offline
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Quote:
Originally posted by twins_lawn_care
Eric,
Even though the carb is new, it may not have had the correct adjustments on it when it was installed (just a guess, and trying to help fix the problem with lowest possible $ for you)
I'd just double check the idle/mix screws, and float level, should take about 10 minutes, and then you can rule that out, and go from there. Also, possibly double check your timing. You could be blowing a lot of unused gas out of your exhaust, which could be a reason for the low MPG and lack of power.
Just trying to help out with where I'd start. I'd tend to think though with your set up, you should be getting around 13-16 mpg though, as others had mentioned.
Something to think about though, is to just take it in for a gas analyzer test at a local carb shop. May cost about $50, but with the prices of gas now, you could easily save that by boosting your MPG up from 10!
Good luck with it, and let us know if you figure it out.
Yes i thought i should get at least 12 mpg. I will check those things you mentioned tomorrow.Thanks
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  #12  
Old 03-26-2004, 07:19 AM
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FrankenScagMachines FrankenScagMachines is offline
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Don't feel bad- I get 9 or 10 in town with a trailer and 12 on highway empty. Bout 11 on highway with trailer. Maybe 12.5 empty on interstate. Best I ever got was highway empty that was 13.5 mpg! This is fuel injected too. Dual exhaust as well (if that's supposed to help.) Man these old Ford's pass anything but a gas station! I have a 5 spd stick and a 3.55 rear end under it. 2wd. 3/4 ton. 351 Windsor EFI. My mileages seem similar to other guys at a Ford truck forum...
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  #13  
Old 03-26-2004, 12:45 PM
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The Dude The Dude is offline
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I have a carbed 302 in my 1979 Ford truck and I get an average of about 8. I get only about 160 miles to a tank of gas, that sucks.
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  #14  
Old 03-26-2004, 01:29 PM
jlewis jlewis is offline
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Eric,
That is why I was happy to come across my deisel!

I am averaging 16. Empty, towing, in town, 70mph does not seem to matter much. I am getting some Stanadyne fuel additive so I will see if that helps any. (Claim it does) I am also switching from 215/85 to 235/85/16 tire tonight (6 Yikes!). With 4.10 gears she is maxed at 70!

Joe
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  #15  
Old 03-27-2004, 06:36 PM
Trevors Lawn Care Trevors Lawn Care is offline
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MINE SUCKS

New 2000 GMC SIERRA gets about 11. ITS SUCKS. i just upgraded from a buick lesabre which got 20. although that was the first tank i tested it on, and i drove it less than efficient. I was still getting used to the V8
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  #16  
Old 03-27-2004, 10:26 PM
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Eric 1 Eric 1 is offline
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Well at least i know i'm not alone. I played with the carb and timing some we'll see what happens.

Oh yeah i ordered a cam two. comp cams 440 lift, called them and this is what they said to get i also order a ''swirl port'' carb spacer and some fancy gaskets that the people at Jegs said would help some so when i get it all done i will let you know what happened.
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  #17  
Old 04-07-2004, 11:19 AM
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BillyRgn BillyRgn is offline
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95 gmc 3500 350motor 9mpg's on a good day
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  #18  
Old 04-07-2004, 11:32 AM
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bugspit bugspit is offline
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Eric 1,
Whats the rear end gear ratio?
If your using a 4barrel carb, swap to a large 2barrel.
Why not go with fuel injection?
It sounds like you are putting a lot of preformance mods on it, what are you expecting, preformance or economy?
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  #19  
Old 04-07-2004, 12:47 PM
T-Time T-Time is offline
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Have you thought about the convertor being restricted, this can make a difference.

Mitch
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  #20  
Old 04-07-2004, 08:54 PM
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Eric 1 Eric 1 is offline
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Quote:
Originally posted by T-Time
Have you thought about the convertor being restricted, this can make a difference.

Mitch
Straight duals baby...no converter.Don't tell.

Bugspit
1.I dont know what the rear axle is all i know is i read on the net that those trucks have between 2;73-3;10 in them.If you saw my other thread you will see i am about to swap my rear end.
I will be installing 3;73 and in a month or so installing an overdrive trans in it so when i am not towing i can put it in overdrive and get some economy out off it.
2.Why should i go to a 2 barrel carb, man talk about gutless.
3.Yep i am installing lots of performance parts, i an trying to find that fine line of both economy and performance.
4.I looked into a fuel injection system from holly for a non ecm engine but it is $780, thats more than i want to spend on something like that for so little gain i would get from it.
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