I had a similar problem once caused by a blocked fuel line. On my Lotus Seven S1 I had a tank made with a reserve section. Some Red Hermetite that I'd used to seal the outlets had got into the tank. It would run for a varying number of miles before stopping. It made journeys of any distance a bit frustrating. I fitted mesh filters over the pickup pipes as to remove the tank would have meant back axle and roll cage out. That worked OK. When in limp mode- does the fuel pump still deliver a gusher? When I was refurbing my Fury, there were bits of rust floating around in the fuel tank. After I'd swilled them out, I dropped a few neodymium magnets into the tank before refitting the sender unit. Even if rust particles form, the magnets will catch them hopefully before they clog the pump or filter.
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