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After months of no problems, Now, At any given time my rv stalls. Twice this week when excelerating. (it's as if the fuel pump quit) R22E, Newly refurb 27 gal tank, Newly replaced sending unit. New pump in Dec 2012 and original pump stand. (Known pump check value defective, problem solved with accessory in-line check valve. This solved my last hard to start problem.) Plenty of fuel. New gas cap. tank Vent line is properly connected. No vaccuum sound when removing cap. Can not re start. The first time it happened, I called road side assistance after about 10 mins of trying to start. While waiting for road side assistance, I removed the gas cap, added 3 gals of gas from my spare can, went under the rv and tapped on the fuel line (took about ten mins). Get back in the cab and it started right up. Drove to a near by gas station and topped off with 10 gals. Drove it all week and could not duplicate the problem. Then on Saturday, crusing along it stalls again. Won't start. removed cap, Tank at 3/4 and added abount 1/2 gal from spare gas can, tapped on fuel lines. Would not start. Called road side assiatance. About 30 mins passes and all of a sudden it starts. ??? Any ideas my R22-E friends??