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BUSY BOLTERS Are you one?  The Shop Area
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Jul 21st, 2025 | | | | Joined: Jan 2009 Posts: 54 'Bolter | | 'Bolter Joined: Jan 2009 Posts: 54 | I am putting a 350 v8 from a 72 c10 into my 56 3100. The fuel pump has a return line but the gas tank does not. What can I do with the return line from the pump? | | | | | Joined: Feb 2000 Posts: 4,886 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 4,886 | Most would just block off the return line. I would plumb it back to the tank as far as I could and "T" it back into the fuel line coming from the tank. This will circulate fuel through the lines and hopefully help with any future vapor lock problems. Use a line smaller then the main line for your return line.
If you pull the sender out of the tank, you may find there is room to add a line. A drill and good solder iron would be about all you need tool wise to make it work. The silver ( in color ) fuel line solders really good due to the coating on it. If you go this way, make the line into the tank long enough to reach 1/2 way down into the tank. | | | | | Joined: Jan 2009 Posts: 54 'Bolter | | 'Bolter Joined: Jan 2009 Posts: 54 | So I could tee it back to the inlet line and be done? Not sure the sender has enough room to add another line. Really small. | | | | | Joined: Mar 2010 Posts: 10,059 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,059 | Does the tank have a drain hole in that particular model?
If so you could access that for the feed line to the fuel pump (just like a 47-53 AD), and run the return line back through the line on the sending unit.
Carl
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Feb 2001 Posts: 1,094 'Bolter | | 'Bolter Joined: Feb 2001 Posts: 1,094 | Just buy another pump that doesn't have the return line. We are only looking at two bolts and about 5 minutes of time.
Tommy
59 apache 1/2t
261 short stepside
| | | | | Joined: Jan 2009 Posts: 54 'Bolter | | 'Bolter Joined: Jan 2009 Posts: 54 | no drain hole on the tank. Replacing the pump would be the best if I hadn't had to put a new one on to get the motor running before I put it in the truck. | | | | | Joined: Jul 2015 Posts: 10 New Guy | | New Guy Joined: Jul 2015 Posts: 10 | Hey 56TN,
I would keep the installation clean.....put a pump that doesn't have the return ($25) install it and don't worry about it every again.
my 2 cents,
Bill
Last edited by BnJ; 04/03/2017 5:38 PM.
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