Suzuki Samurai - Cleaning out Fuel Lines and Fuel Pump.
I got another almost new fuel pump working again just by using WD40 and Marvel Mystery Oil to clean out the junk and gummed up gasoline. Today's modern gasolines go stale faster than the gasoline of 30 or 40 years ago. To clean the fuel line from the fuel pump to the gas tank, first disconnect the line at the fuel filter (near the gas tank) then disconnect the fuel line at the fuel pump. Use spray carburetor cleaner and then blow out the line going from the fuel pump back to the gas tank (downhill) & in the opposite direction of the gas (fuel) flow. Repeat this several times. Also on the nozzle for the blower from the air compressor, use some heavy tape so it files in the fuel hose tight so you get a lot of air through the fuel line and blast out all the dirt.
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1985 Suzuki Samurai, Jimny 1300, SJ413, JA51