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The SAE 30R9 and 30R10 are also acceptable for the IP return as they are high temp rated. 30R9 has a Viton liner and CPE jacket. I believe 30R10 is Viton in and out.

I think 5 feet did it but I don't recall. I would also get the 1/4 inch hose out of the injection pump in Viton as well. Fuel is hot there too. Make sure you get the thick walled tubing.

The fuel injectors likely have metric barbs on them but I promise the 1/8 tubing fits well. I have used the 1/8 for years and I don't use any clamps on the tubes. I suggest the McMaster route because you're guaranteed to get Viton tubing. You won't know what you're getting elsewhere.

A note on the injector return lines, the OEM lines are Viton rubber, they will outlast the engine. Aftermarket lines are buna-n rubber and these are the ones that get hard and crack after about a year. I am starting to see aftermarket kits in Viton. You can also buy 1/8 Viton tubing and make...