Dsluder

It is finally running. I replaced the wiring harness and now it fires right up. In the end I replaced pretty much the entire fuel system. I replaced the harness yesterday and was having the same issue. Tonight I replaced the fuel lines and fuel filter ( filter was new) and while trying to prime the lines I found out the new harness had the fuel pump wired backwards. Once I swapped the wires and primed the system it fires right up. I increased the idle a little and it runs pretty well for sitting up for a few years. It has about 1600 miles on it so hopefully it will keep going for a while. I'll change the oil and get it put back together to see how well it runs under a load. I appreciate all your help and I hope anyone else having this issue finds this post helpful. Harness was 80 dollars on ebay. Took about 30 min to swap out. Hind sight I wish I would have tried that a while ago.

I haven't seen any Bosch components. I looked for any earth's today and only found 1 main ground to the motor. I did disconnect and clean. Still same issue. Fires right up with intake blocked. Won't start otherwise.

Thanks! I'm going to get back into it this weekend. I will update once I've gotten these checked. Maybe I can find a solution so the next person with this issue will not need to beat their head against the work bench for as long as I have. Lol

I did order the wiring harness. Found it on ebay. I will definitely give the fuel system a good once over also in the meantime. I changed the fuel pump in hopes to solve any of these issues. It wouldn't be the first time I have received a bad parth though. I have a fuel pressure gauge I can insert at the injector to see what kind of pressure is making it to the injector. I did take the plug aprt for the injector in order to test the amount of voltage at the plug. I wasn't able to get a 12V reading. Best I was able to get was 10V without a manual I'm not sure if this is an acceptable reading. I did test the injector with 12V and it worked properly. This is what led me to change the ECU. Unfortunately after changing it I am having the same issue. Are there any procedures for resetting the ECU?

I looked up the vin and it is a 2012 hisun 500. Didn't get any more info from it than that. I included it below. Not sure it will help. A manual would be great! I could check grounds and see if that may be the issue. At this point I think I'm going to get a new harness and see if it is a wire issue. My only hesitation with that is the harness only plugs in and if it is a ground issue it will not help.

This is a utv. I need to look up the vin again to see exactly what model. It is an older machine. The pump runs when the key is turned on. I haven't checked the pressure but did replace the pump. I wanted to eliminate that issue first. If I put 12 volts to the injector it sprays fine. The injector is also new. I don't have a service manual. I see there is one for download on this site so I will get that downloaded. The last possible issue I can fathom is a faulty harness.

I am having an issue with a hs500. I bought it broken and have been trying to get it running. It seems to be starving for fuel. If I put my hand over the intake it will crank but will not run for very long because I'm not able to get the correct airflow with my hand. The things I have done so far are. Replaced the fuel pump, fuel filter, mass airflow sensor, idle air adjuster, fuel injector, cleaned the throttle body, replaced the ecu, and still the same issue. I notice the injector does not spray when removed from the head. I dont know if that is common. I am out of ideas on what to do next. I have removed the fuel line from the injector and it is getting plenty of fuel. If anyone has an idea on what could possibly be the issue I would be happy to try anything at this point.