check your fuel filter, fuel lines, baka barado na. Usually pag matagal na di nagagamit ang tsikot, at madumi yung gas na nagamit, mag settle yung sediments, tapos titigas. Baka yun ang may sala. check if fuel is still flowing by unplugging the fuel line hose going to the engine, pag ni redondo mo yun, pupusit ang gas kung ok pa.