Profyrfyter Posted January 11, 2009 Share Posted January 11, 2009 I've got a quick question, do these cars get horrible gas mileage? I know I need a good tune-up and I have to adjust my valves but I drove my car around the block (right about a mile round trip) and the car burned around 1/2 gallon.I'm just wonderin' if that's normal! Thanks,Dave Link to comment Share on other sites More sharing options...
1929Chrysler Posted January 11, 2009 Share Posted January 11, 2009 Maybe you have a gas leak? I don't know exactly what gas mileage my car gets but the '29 was completely empty and I put a gallon of gas in the tank and drove it home which was just about ten miles with gas to spare. I'm curious to see what others have to say about their gas mileage.Dan Link to comment Share on other sites More sharing options...
Profyrfyter Posted January 11, 2009 Author Share Posted January 11, 2009 Thanks for the reply, I know that I need to do a tune up and that probably has something to do with the gas mileage. I should probably replace the carburetor gaskets and maybe needle and seat??Dave Link to comment Share on other sites More sharing options...
RickBrinker Posted January 11, 2009 Share Posted January 11, 2009 I get around 7 0r 8 with my 25 and 10 0r 11 with the 29 Link to comment Share on other sites More sharing options...
Profyrfyter Posted January 11, 2009 Author Share Posted January 11, 2009 I figured it wasn't going to be the greatest but I should get more than about 2 MPG huh? haha So do you think the tune up and new gaskets in the carb will help? It has some oil blow by but I believe I read that a little is normal? It's a pretty small amount.Thanks!Dave Link to comment Share on other sites More sharing options...
dwollam Posted January 12, 2009 Share Posted January 12, 2009 Make sure your float has not sunk. I get around 15-17 mpg with my 22 screenside. Float cracks and leaks are very common. Link to comment Share on other sites More sharing options...
Profyrfyter Posted January 12, 2009 Author Share Posted January 12, 2009 Ok, I'll have to check that, what should I do if it's cracked? Are you talking about the float inside the vacuum chamber or is there one inside the carburetor also?Dave Link to comment Share on other sites More sharing options...
dwollam Posted January 12, 2009 Share Posted January 12, 2009 Inside the carb. Replace it or carefully solder it up. If it has gas in it, drill a small hole to drain and take precautions to get rid of the fumes before soldering. Link to comment Share on other sites More sharing options...
FMF Posted January 12, 2009 Share Posted January 12, 2009 1925 Coach --- 9-10 MPG. Link to comment Share on other sites More sharing options...
Profyrfyter Posted January 12, 2009 Author Share Posted January 12, 2009 Hmmmm, solder a container filled with highly flammable gas fumes? Sounds like a worthy challenge. I'll have to see what I can do! I never had the question answered about where the float is, I know there's a float in the vacuum chamber and there's on in the float chamber, are you referring to the one in the float chamber as the common problem?Dave Link to comment Share on other sites More sharing options...
vergil Posted January 12, 2009 Share Posted January 12, 2009 Hi Dave,Check your repair manual, pp.141ff. That should help somewhat.Bill Link to comment Share on other sites More sharing options...
keiser31 Posted January 12, 2009 Share Posted January 12, 2009 There is a float inside the carburetor. Link to comment Share on other sites More sharing options...
platt-deutsch Posted January 12, 2009 Share Posted January 12, 2009 Just use a soldering gun not a torch! Link to comment Share on other sites More sharing options...
Profyrfyter Posted January 13, 2009 Author Share Posted January 13, 2009 Good thing I have one I'll have to check that out. I may as well get a gasket set for it too. Are there any other parts I should get besides gaskets? What about needle valve/seat? I need a new return spring for the throttle lever but I know I can get one of those from Myer's Link to comment Share on other sites More sharing options...
Guest DodgeKCL Posted January 14, 2009 Share Posted January 14, 2009 Our old cars and trucks get ugly gas mileage compared to todays vehicles. The best you will ever get will be in the teens per gallon. Usually around the 15 mark. This of course is if your carb and lines have no leaks. Originally the owners didn't worry if the carb had some fuel stains on it as it got older,gas was cheap,but today that could eat up quite a few miles per. I spent a lot of time sealing my carbs. Make sure the 2 mating surface are flat with a steel ruler. Carefully run them over a piece of fine sandpaper on a hard flat suraface to true them up and seal them with the RTV silicone rubber Mopar dealers sell for this job. Make sure the 'idle air adjustment' makes an obvious change in engine revs as you turn it in and out. If it has no 'high' spot you need engine work as there is insufficient vacuum at the carb. Also make sure the throttle shaft is tight in the carb. It can be shimmed with thin brass sheeting if it is too loose. With the throttle shaft letting air in around itself, you will have trouble setting the idle air screw. (I should have put this fault before the 'engine work' one.) As the guys have said the brass float could be 'full' of gasoline and this will cause poor gas mileage as the engine is always running rich. 'Rich' means more gas and lousy mileage. The float is very easily soldered shut with and electronic pencil soldering iron. In fact solder was used to make it in the 1st place. Link to comment Share on other sites More sharing options...
Profyrfyter Posted January 15, 2009 Author Share Posted January 15, 2009 Thanks for all the tips, I'll have to tear it apart to see what it looks like. I'm going to order the gasket kit first.Dave Link to comment Share on other sites More sharing options...
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