Hi, new guy here with a question concerning fuel line adequacy.
I have a '59 Triumph TR3 with SU carbs that I'm considering changing to EFI. One consideration I have is the fuel lines. I see that it is usually recommended that 3/8" lines be installed, with a 5/16" return. The original feed for the mechanical pump is 5/16" diameter and comes out from the bottom center of the fuel tank, runs along the frame and up into the engine compartment. I like to splice into this line with the electric fuel pump, and run the return along the other side of the frame and dump back into the top of the tank where there is a vent line which is also 5/16" in diameter.
The stock engine is about 100 HP at 2.0 liters. My engine has been modified to 2.2 liters, and has, if I'm lucky, 130 HP. So, will a 5/16" fuel line support this?? Or is there another reason for using a 3/8" line other then the amount of fuel delivery necessary for the amount of horsepower being produced??
Also, If I have to go to a larger line, I'd also have to change the outlet fitting in the bottom of the tank. That would mean tank removal and welding in a different bung. Something I'd rather not have to do.
Thanks,
Art
Fuel Line Diameter
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: Fuel Line Diameter
5/16" fuel line should be perfectly adequate for anything I could imagine a reasonable TR3 build making.
