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fuel sending unit #175876 12/26/08 11:13 PM 12/26/08 11:13 PM
Joined: Apr 2007 Posts: 160 connecticut 6 69charger R/T OP member
69charger R/T OP member 6 Joined: Apr 2007 Posts: 160 connecticut	I have a 69 charger with a 440 I need a new fuel sending unit, the one in the car now is a 5/16. I want to get a 3/8 sending unit and change the fuel line to 3/8, do I have to run a return line for the 3/8 sending unit ? Can I plug the return line nipple on the 3/8 sending unit and just run a 3/8 line to the fuel pump and run it like that ? Thats the way the 5/16 set up is. Alan

Re: fuel sending unit [Re: 69charger R/T] #175877 12/26/08 11:18 PM 12/26/08 11:18 PM
Joined: Mar 2004 Posts: 292 New York City G groundpoint6 enthusiast
groundpoint6 enthusiast G Joined: Mar 2004 Posts: 292 New York City	A 1969 Mopar should only have one fitting coming off the sending unit. Buy the 3/8 float and send the line right to the fuel pump. If you have a vented gas cap you won`t have a problem.

Re: fuel sending unit [Re: 69charger R/T] #175878 12/26/08 11:23 PM 12/26/08 11:23 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: do I have to run a return line for the 3/8 sending unit ? Can I plug the return line nipple on the 3/8 sending unit and just run a 3/8 line to the fuel pump and run it like that ? Alan (1)no (2)yes EDIT a return line is very good for combating vapor lock if you have that issue next summer & are easier on the pump as it is never deadheaded & if necc you can vary the orifice to the lower the psi if your pump psi is right on the edge of overpowering the needle/seat but there needs to be enough volume(by checking psi) at the end of the straights. Last edited by RapidRobert; 12/26/08 11:46 PM. live every 24 hour block of time like it's your last day on earth

Re: fuel sending unit [Re: RapidRobert] #175879 12/26/08 11:31 PM 12/26/08 11:31 PM
Joined: Aug 2004 Posts: 3,333 MARYLAND 69Cuda340S master
69Cuda340S master Joined: Aug 2004 Posts: 3,333 MARYLAND	I just did that upgrade. I plugged the return line on the sending unit. My car has a vent hooked to the gas tank filler neck. I don't believe my cap is vented.

Re: fuel sending unit [Re: 69Cuda340S] #175880 12/27/08 12:53 PM 12/27/08 12:53 PM
Joined: Apr 2007 Posts: 160 connecticut 6 69charger R/T OP member
69charger R/T OP member 6 Joined: Apr 2007 Posts: 160 connecticut	Thanks guys for the info, I have never had any vapor lock problems. I'm going to plug the return and run a new 3/8 fuel line Alan

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