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Carb Fuel Line |
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2_Nautiques 
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Joined: March-22-2006 Location: United States Status: Offline Points: 251 |
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 Topic: Carb Fuel LinePosted: June-05-2006 at 8:38am |
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Pick up an adapter that went from 5/16" tubing to a 5/8-18 thread in the carb. Worked great. I had to cut off about 1/2" from the existing tubing and reflared with new nut. Simple repair. Thanks for the help.
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David F
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Joined: June-11-2004 Location: United States Status: Offline Points: 1770 |
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Posted: June-02-2006 at 4:07pm |
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Don't forget to put the nut on the line BEFORE you make any tight radius bends and before you flare the second end. The nut will not slid past even a relatively generous radius. Make sure the bend coming out of the carb is not too close to the end so that the nut has room to slide clear of the threads on the carb inlet.
    
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2_Nautiques
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Posted: June-02-2006 at 12:59pm |
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David, you are correct, I am concerned about rubber hose on the pressure side of the fuel pump and you were also correct about the line size. The existing line is 5/16" but the new carb is 3/8" I think? Now that I have a bender and flaring tool, I should be able to get something to work.
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David F
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Posted: June-02-2006 at 10:30am |
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I am not sure I understand what 79 is saying, but my advice is to NOT have any rubber fuel line on the pressure side of the fuel pump for safety reasons on a marine inboard engine.
Sorry about the incorrect assumption on the line size 
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79nautique
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Joined: January-27-2004 Location: United States Status: Offline Points: 7872 |
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Posted: June-02-2006 at 9:13am |
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there are two types or length fuel filters used on Q-jet carb's, a short and 1ong version to tell the difference, look at the piece that has the 1" hex if it has a long round section 1/2"-3/4" long in front of it, then get the long filter that goes in the carb, and don't forget to get some rubber hose and clamps for the size tubing you have to install the inline filter.
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2_Nautiques
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Posted: June-02-2006 at 8:58am |
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Doh!
Picked up new fuel line on the way home ready to install and found out that the new carb has what looks like a 3/8" inlet instead of the 5/16" I allready shipped back the old core so I can't swap it out. Well it's back to the parts counter, might be able to put something together like 79 suggested.
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79nautique
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Posted: June-01-2006 at 2:42pm |
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while you have the line off use a 1" wrench and remove the other fitting attached to the carb and replace the fuel filter and nylon gasket on the end of the fitting. You don't have to replace the whole line just a small section and install a clear inline filter using rubber hose in between the two steel line sections. This will make the carb filter last long and easier to change in the future.
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2_Nautiques
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Posted: June-01-2006 at 2:13pm |
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David, I am borrowing a bender and flare tool from the plant here and hope to pick up tubing on the way home. Thanks
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David F
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Posted: June-01-2006 at 11:25am |
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Yes, you do it yourself. However, chances are not good that you will find a pre-made straight line of the correct length. So, you will need to buy a flaring tool (not expensive and available almost any auto parts store). you will also need to buy a bending tool. Practice with the flaring tool before bending the line.
Not sure on the size, but my GUESS is 5/16" |
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2_Nautiques
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Posted: June-01-2006 at 9:56am |
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I just installed a new carb on my Cuddy 350 OMC with a quadrajet. The PO stripped the hex off of the brass fitting that connects to the carb. This is a pre-bent steel line with flared straight fittings on each end. What are my options? Can I buy a straight section and bend myself? If so what size is it and where do I get one? DIM has a line but it is for a Holley.
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