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Detroit Model 51 carburetor - massive fuel leak
#1
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Stephen Templeton
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I'm getting my 1931 840 back in starting condition. I'm working on several issues, but I had the carburetor rebuilt with a rebuild kit from pac-carbs.com, and now I've got a massive leak. It looks like the bowl is overfilling, and I probably need to adjust the float. Any other ideas- The 2 minute video of the start and massive leak can be seen with this Vimeo link:

https://player.vimeo.com/video/708774529?h=90cdc93358[/url]

Thanks for your input!
Stephen

Posted on: 5/11 13:55
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Re: Detroit Model 51 carburetor - massive fuel leak
#2
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West Peterson
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Are you using gravity feed, or do you have an electric fuel pump connected?

Per Parker Roaf: It looks, at first glance, that the float is sunk or the needle is not seating fully in its seat

Posted on: 5/11 14:33
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Re: Detroit Model 51 carburetor - massive fuel leak
#3
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Stephen Templeton
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West- thanks for your reply. I do have an electric prime pump, but the massive leak is occurring using only the stock mechanical fuel pump.
Stephen

Attach file:



jpeg  IMG_3519.JPEG (771.58 KB)
184962_627c116e9b2ce.jpeg 2048X1536 px

Posted on: 5/11 14:41
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Re: Detroit Model 51 carburetor - massive fuel leak
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West Peterson
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I keep forgetting that the 1931 models were fitted with mechanical pumps (vs vacuum).

Posted on: 5/11 14:48
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Re: Detroit Model 51 carburetor - massive fuel leak
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West Peterson
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I'd check to see if the float is sinking, as well as making sure the needle is fully seated.

Posted on: 5/11 14:52
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Re: Detroit Model 51 carburetor - massive fuel leak
#6
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Greenfield
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Yikes that is one helluva leak! Its almost as if there is no fuel bowl needle in there at all. I'm in agreement; perhaps the float is sunk or the needle is getting bound up somewhere.

I have an 8th series with a DL 51 (standard) and what I do after its been sitting a while is to prime the cylinders with a tablespoon of gasoline, then try to start it. Also, when starting, only hit the accelerator as the engine is turning over (right foot on the starter button, left foot working the gas pedal). If you hit the gas on an updraft carb absent starting, the fuel falls down and drains out and you loose the effectiveness of fuel vapor entering the cylinders, at least this has been my observation.

Posted on: 5/13 16:54
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Re: Detroit Model 51 carburetor - massive fuel leak
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1929PackardGuy
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Another vote for a sunk, or non-existent fuel float. And another agreement on pumping that pedal. Does you no good at all to pump the gas pedal on an updraft carb unless the engine is turning. Without the upward suction of the engine turning, all you're doing is creating a bigger problem by pushing gas out into the carb with nowhere for it to go.

Posted on: 5/17 12:00
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Re: Detroit Model 51 carburetor - massive fuel leak
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West Peterson
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There is a throttle on the steering column, so using your left foot on the floor pedal is really not needed.

Posted on: 5/17 12:08
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Re: Detroit Model 51 carburetor - massive fuel leak
#9
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Stephen Templeton
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Float was fine and the needle seats perfectly well, but still leaking. I spoke with Scott Henningsen of pac-carbs.com, and he said one of the most common causes of leaks is due to warping or pin holes in the pot metal lower section leading to float bowel over fill. I’m going to send the carburetor to him to rebuild as he has manufactured all the replacement parts needed. Thanks for everyone’s input!

Posted on: 5/17 19:49
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Re: Detroit Model 51 carburetor - massive fuel leak
#10
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Greenfield
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That appears to be a 32 carburetor, as the tube from the float bowel cover to the throttle choke is missing.

Posted on: 5/21 17:12
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