 Remove/plug fuel return line, FI to carbs |
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| 930cabman |
 May 23 2021, 05:53 PM
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#1
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Advanced Member  Group: Members Posts: 3,073 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States 
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Our rust free project is progressing well and considering either removing or just plugging the fuel return line. We did this with a similar FI to carbs conversion on a 1985 Alfa spider. Used a Facet low pressure electric pump with a fuel pressure regulator. Engine is a 2 liter, carbs 40 DCOE, pressure 2.5 psi. She runs out well. Just plugged the fuel return line.
Thank you |
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| barefoot |
May 24 2021, 06:06 AM
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#2
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Senior Member Group: Members Posts: 1,276 Joined: 19-March 13 From: Charleston SC Member No.: 15,673 Region Association: South East States
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That's what I did. no need for 2nd fuel line.
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| bbrock |
May 24 2021, 07:52 AM
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#3
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains
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There are some advantages to keeping the return line even with carbs. One of which is that it keeps your reserve fuel bowl filled so you don't start sucking air before your tank is completely empty. I just dropped this bypass regulator (PMO also makes one for this purpose) in to feed a steady 3.5 psi to the carbs and return the rest back to the tank. Even with stock FI fuel pump it works great.
(IMG:http://www.914world.com/bbs2/uploads_offsite/i.ebayimg.com-20845-1621864377.1.jpg) https://www.ebay.com/itm/371739673458 |
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| rfinegan |
May 24 2021, 08:00 AM
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#4
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Senior Member Group: Members Posts: 973 Joined: 8-February 13 From: NC Member No.: 15,499 Region Association: MidAtlantic Region
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Return line keeps fuel cool and helps Reduce vapor lock
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| brant |
May 24 2021, 01:43 PM
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#5
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914 Wizard Group: Members Posts: 11,625 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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Return line is superior
Also what the factory did I’ve posted this 100 times now... with diagrams |
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| 930cabman |
May 24 2021, 02:09 PM
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#6
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Advanced Member Group: Members Posts: 3,073 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
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Thank you all for the information. For centuries we have "dead headed" our fuel lines with carb'd machines, but maintaining a return line appears to have advantages.
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| SirAndy |
May 24 2021, 02:56 PM
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#7
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Resident German Group: Admin Posts: 41,651 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(rfinegan @ May 24 2021, 07:00 AM)  Return line keeps fuel cool and helps Reduce vapor lock (IMG:style_emoticons/default/agree.gif) |
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| porschetub |
May 24 2021, 03:20 PM
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#8
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Advanced Member Group: Members Posts: 4,701 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
I used the return to run the power wire for my front fuel pump install,keeps it safe and secure and atleast it has a use .
I often wonder what the factory euro carbed motors used ?. |
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