so please be patient if you respond and don't hear right back from me. Repeat the voltage test on the newly disconnected plug to confirm the final injector is not short-circuiting the injection system. OK so i took the ccarbs out of my Honda 1980 CB650 cleaned them out and put them back in, also in the process i installed a inline fuel filter. New plugs seems to be an intermittient spark, Fuel pump comes on and acts normally. Yes, we said earlier that Harley engines need the fuel of at least 91 Octane to run optimally. 22. Oh well, gotta have it. No wonder the pump could not provide the fuel to the injectors. Pulled the goods out of the tank and found the plastic fuel line from fuel pump to the filter was broke into. Fuel Injector Replacement: $379.42 - $3631.88: Get a Quote: Electrical components are not working Inspection: $79.99 - $89.99: Get a Quote: Disconnect the fuel injector electrical plugs from each of the fuel injectors. I have a 2004 Harley Roadking Classic, I went riding to day, oppss, and tipped it over onto the crash bars, sitting at a light. It was still running, I stood it up and started down the road, it started out ok, just for a 1/2 block, then started acting like it was starving for fuel, I … Submitted: 8 years ago. The PCM uses the trigger signal from the crankshaft position sensor, and/or camshaft position sensor to pulse the injectors. the valve on the tank is not plugged neither is any of the lines buf for some reason the fuel will not pass through the filter. The hose plugs onto the backside of the petcock. now the bike is getting no fuel ( i can see a empty fuel filter.) 20. Recommended Services. Although they share arguably the same V-Twin engine design, Harleys do not use the same fuel. If you're not getting any vacuum or the diaphgram in the petcock is damaged, you won't get any fuel to the carb. I replaced the fuel pump, fuel filter, and tank selector switch, but still no fuel. When this happens, no fuel gets to the carb or not enough. I may not be able to get back on-line until Monday evening or Tuesday. 2003 Harley Classic, fuel injected. 91 Octane means premium fuel, and it is what Harley advises users to use on the bike. Harley-Davidson Fuel Injection basics It is a sad day in Hogville. If the engine has a fuel pump, you should not have to prefill lines/filters. it's kind of up in the air. To test the final fuel injector, connect it and pull a prior connected electrical plug. For those of you who haven't noticed or are stuck back in the 80's, a large number of the bikes coming from Milwaukee have fuel injection installed. The '96 and later Harley's have a vacuum operated petcock if it is still stock. The mighty Harley is slowly loosing its carburetor. Resistance Testing. 21. We always recommend replacing the float needle valve every 2-3 years or immediately following any prolonged storage where a fuel stabilizer was not used. E85 pump fuel contains 85% + Ethanol and will begin to damage parts in the carburetor that were never designed for this type of fuel. Found the problem few days ago. Put a pressure test on the system and found it would not hold. It gets vacuum from the intake maniold or backside of the carb through a small vacuum line. Won't start. However, Harley may need a different fuel sometimes. In 1996, Harley went to a vacuum operated fuel petcock. $60 latter at the stealership took me all the way. The vehicle is not getting any fuel to the engine. To test, pull the hose off the carb and put the end of it in a catch can. Spin the engine with the starter and watch for fuel coming out of the hose. It has a diaphragm in the backside of it that can develop a hole in it. 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