Randy Stevens

Nope!

It could be moisture in fuel, not uncommon. For future reference , I burn nothing but highest octane in mine and use good quality fuel such as BP. Hisun 550 and runs like a champ. Good luck buddy!

Just for the sake of knowing, can you attach jump wire from positive side of battery to pump and see if it stays running? You might have to find a hot wire when key is on to by-pass. Just a thought?????

Wow, this is another obstacle that may hit me one day? Mine is a 2019 too and was brand new when I bought it, 30 days later it was in shop for a month, they said it was a drivers side seat belt safety issue, I was told that they replaced the seat belt assembly and that cured the problem, come to find out, they did not replace anything. I returned to dealer to look at their work order on it and surprisingly they lost that work order. In other words.., they lied. Took it to a local mechanic and he fixed it within an hour. Clogged injector, blew it out and it ran great for about a month, then same issue, I pulled injector, blew out the port and injector and runs great again for about another month, called local mechanic for any advice and he told me to run premium fuel, higher octane and see if that helps, that was several months ago and it’s been running flawlessly so far! Sounds like you having same issues, might try higher octane and see if it helps???

I have contacted Hisun themselves in Texas and all they will tell you is to contact one of their dealers for help, when I contacted them for my issue, they told me that they are trying to learn themselves how to work on them and they charge $125 an hour to “GUESS” at my problem. I asked dealer about codes and how to do diagnostic and their answer was We Don’t Know....... yet?? I’m doing my own troubleshooting and luckily, mine had been fuel issues and that’s not to hard to figure out. A learning experience but so far it’s still running ok!

👍

I have watched several videos on mine and on Coleman’s. They do have some similarities but unfortunately for me, that port doesn’t exist in mine. I wished it did but as of now, it’s running flawlessly.🤞

Yep, I have no such connector, none that I seen so far and I’ve been over every inch visibly as possible without dismantling.

Might help a bit to know what issues you’re having, if any? If none, then finding the port might be tough. I’ve looked everywhere on my Hisun 550 and had no luck. Hisun sure won’t give you no support! Great machine when it runs.

I’ve had a 550 for 2 years and I’m still looking for it

Try blowing out injector. Mine did same thing. Had plastic particles in it I’m guessing from inside gas tank as it’s all plastic anyway, maybe a burr from injection machine that form it?? Mine since idles fine after warming up a few seconds. Hope this info helps!

Sorry for spelling , i meant atv/utv’s

Unfortunately Mick, Hisun will provide you with little to no info. They want us to depend on their dealers to handle these sub-par machines. I’ve had issues with mine in the past and when you contact the requested dealer, they admit that the are behind in their work on these because they personally don’t know enough about them themselves! At least they were honest enough to tell me and at $125 an hour, you can’t afford to have them fix it and let them sit at shop for weeks in end till Hisun finds the issue and pass through info onto dealer’s technicians. I found a local country boy who works on arc/tub’s out of his garage and he fixed mine up within couple days. I know you perhaps don’t have such a local -yokal in your parts, but Hisun techs won’t give you time of day on these. I’ve filed complaint. with BBB as to warn potential buyers to do extensive research on these! It’s a fine machine when it runs otherwise it’s a piece of junk! Chinese Crap! Sorry I can’t offer a motive CPU orcrank sensor would be a starting point? Good luck.

I found a plug in port on mine under hood by radiator. Not sure if that the diagnostic port or just an adapter for power supply????

Sorry, meant to say schematic on EFI are worthless. Motor runs fine

Personally, ( & I own one) these thing are junk! The suspension and body/ frame and steering work well but the schematic on motor are worthless! Chinese crap but I’m like you... mines a 2019 with 400 miles. 3 weeks after I bought it, it was in shop for 2 months! I’m considering switching to carburetor for mine and do away with efi. Motor runs good when it runs!

I was told by mechanic that did first initial repair that these motors need good grade fuel such as BP, Mobile Oil, Chevron, Shell etc, plus a higher octane would improve performance greatly.

Hi Mick, after my first issue, mine started doing same thing, thus I pulled injector and throughly cleaned and blew it out, runs fine again. I’d suggest putting a new one in. They come with cheapo’s from China, but that’s not saying new ones are built there too but they are cheap in price. Check fuel pump assembly to make sure it has a filter to catch garbage being sucked up from gas tank. Should correct your problems. I’ve learned a lot about mine lately but it still runs great with a little maintenance!!

I just started narrowing things down as suggested by many, electrical, air, fuel filters, fuel pump, oxygen sensor, then injector was last and it turned out to be culprit. Had white plastic shavings in it and was clogging the fuel flow and spray. It only had one injector! Hope this helps everyone!

Actually some on here gave me clues, plus internet helped out too!

Just to update everything, got my Hisun running again, bad injector. These machines are now know for such issue. Put in new injector (compatiable, better built one) & it runs better than new! Thanks for everyone’s help here. Hopefully it’ll help others with same issues!

Totally agree and any knowledge that comes my way will definitely be passed on to others here! Many, many thanks!!

Thanks Ken, yeah I’m gonna wait on tech to give me an appropriate answer but he said he had to go thru the channels with a Hisun tech because he doesn’t even know himself. Hisun needs to educate their service reps and service what they sell. It’s common practice everywhere else. This is a good running machine WHEN it’s runs!!!! I will let everyone here know when issue is diagnosis and cure is found so that others won’t go thru so much red tape for a fix!