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Disconnect the fuel line that goes from the pump to the fuel filter and check for flow - if you get fuel there, the pump is ok. If not, the pump needs to be replaced. If ok, re-connect the fuel line and disconnect the line that comes out of the filter (filter to engine) and checlk for flow. If little or no flow, replace the filter. If filter is ok, reconnect the fuel line and look for an obstruction further up the line. You could also trouble-shoot in reverse by disconnecting the fuel line where it connects at the engine and checking for flow there. Then just work backwards from there.
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