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Found the Problem With Fuel 41 Special Deluxe

 

(@jerry-berry)
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After literally months of changing carbs, fuel pumps, fuel lines and fuel filters, I finally conclusively found the problem with my 41 not pumping fuel. I bought an electric fuel pump thinking the carb wasn't getting enough pressure. When I loosened the fitting to the fuel tank, no fuel, or very little came from the fuel tank fitting...what the......??? It had at least 5 gallons of fuel in it so it should have dumped gallons. So...with the electric pump still temporarily installed, I took the line from the fuel pump and plugged in a fuel hose and ran it to a 5 gallon can of gasoline. Voila, the car runs like a champ, starts immediately without priming and sounds like it would idle 'til it runs out of fuel in that temp fuel tank. 

What bugs me, is the tank is new...literally new! I haven't pulled it yet, but I have to find out what's wrong inside or just get another new tank. But, what a relief to know what's been causing the problem. Thanks to all who gave great advice. I love this site!


   
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Tiny
 Tiny
(@tiny)
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Glad you got if figured out. This has been an important trouble shooting lesson. I believe I mentioned in your other thread to start at the place you're not getting fuel (carburetor) and work your way back, one connection at a time, until you get to where you are getting fuel. Had you done that you would have discovered early on, and in fairly short order, the tank is plugged for some reason. Don't assume that a part is good just because it's new. It seems like a hassle, disconnecting each fitting one at a time but look at all the money and frustration doing so would have saved. You'll likely have to pull the tank and flush it. I'd wager a small piece of debris (shipping packing, manufacturing debris, piece of crud from the gas can used to put gas in it, all of the above??) is in the tank and being drawn to the outlet. Just blowing through the fitting won't likely remove it permanently.

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Save a life, adopt a senior shelter pet
1938 Master Business Coupe
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(@jerry-berry)
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@tiny Tiny, you are one very smart man about these old cars and I appreciate you and all your great advice. The things I checked on this problem were old and looked more like the culprit in getting gas to the carb. The one thing that turned out to be the problem looked new. Remember, the only thing I know about this old car is what the previous owner told me, so I took him at his word and the visible evidence convinced me the tank was new. However, I pulled the tank after yesterdays post and found rust in the bottom of the tank. So, long story short: I ordered a new tank from Tanks Inc. Should be here Friday and I then get to drive this old warrior. 

I need one more piece of advice: Should I go ahead and install the electric pump as a primer for future use? I've heard these old cars are hard to start if they've sat for a while and a pump helps fix that? What say you?


   
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Tiny
 Tiny
(@tiny)
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I've installed one on my 53 but haven't yet gotten around to it on my 38. There are a couple of ways to plumb it. If the electric pump allows fuel to be pulled through it when not in use you can plumb it directly into the line between the tank and mechanical pump. I wasn't able to find an electric pump that was resistance free though. For that reason, the one I mounted on my 53 I chose to plumb differently. When I blew through the pump, to check the resistance to flow, I could do so but it required a bit of pressure to get the air to pass. I wasn't comfortable with putting my mechanical pump under that much of a load so I invented a different way. Using a one-way valve my set-up allows the gas to use the path of least resistance. When not activating the electric pump, letting the mechanical pump do the work, the easiest path is through the one-way valve, bypassing the electric pump. When I activate the electric pump to prime the carburetor, the one-way valve prevents the gas from flowing back toward the tank in a loop, directing it toward the front of the car. The schematic is below.

FuelPumpLayout

7046 old site posts
Save a life, adopt a senior shelter pet
1938 Master Business Coupe
1953 210 Sedan


   
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(@jerry-berry)
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@tiny I think I saw your diagram when I was considering options. I decided to leave it mechanical and run it a while to see how its gonna work. I drove the old car yesterday for 20 or so miles. Stopped and filled the tank and confirmed my sending unit is working. I am very excited to see the old girl running. Had lots of thumbs up on my drive. It's not running super well probably because I never timed it after I was able to start it. I will get to that maybe tomorrow. Thanks for the advice Tiny.


   
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(@jerry-berry)
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After installing a new tank in the old girl, I hesitated to start it and see if she would run. This was my last resort to get the thing drivable. Hit the starter and she cranked and idled immediately so I let it run for a few minutes and then had the nerve to give it some gas. That's when it would run out of prime before installing the new tank. But, she ran like a top. Quick acceleration on the peddle cause hiccups I'm sure it's because I've never timed it. Anyway, I took her out and around the neighborhood and it drove like a champ. She's going to need some new steering parts for sure. I later rode and got her up to about 55 indicated MPH, but other cars were passing me pretty quickly leading me to believe the speedometer is probably not that accurate. Anyway, it really was fun to drive. Now to start on the steering gear stuff and other needed repairs, but, I'm one happy camper!!!


   
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Tiny
 Tiny
(@tiny)
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Great news!

7046 old site posts
Save a life, adopt a senior shelter pet
1938 Master Business Coupe
1953 210 Sedan


   
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