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The steel lines lasted since the early 80s. Rubber lines tend to break down after 10-15 years.
Personally, I would run cheap carburetor-grade rubber fuel lines all the way front to back. No need to waste money on fuel-injection rated hose (the 61X motors don't pressurize the lines).
Make sure the tank strainer is clear, if it's blocked I could see the IP collapsing the rubber lines when it's trying to suck in more fuel (not a catastrophic failure, it would just make it drive slower until the screen was cleared).
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