klm

water in the gas ??

head-gasket maybe

Good write-up — you already did a lot of the right things. A 2005 Polaris Ranger 500 is pretty simple fuel-wise, so the good news is there aren’t many mysterious sensors that “shut fuel off”. This problem is almost always mechanical: fuel delivery, vacuum, carb, or spark. Let’s answer your two questions directly, then I’ll give you a short attack plan. 1) Is there a sensor that restricts fuel flow? No. On a 2005 Ranger 500: There is no electronic fuel control, no ECU, and no sensor that shuts fuel off. Fuel flow is controlled by only: • Fuel pump (vacuum-operated) • Fuel lines • Carb float & needle • Tank venting • Petcock / fuel valve (if equipped) If the float bowl was full, the pump was doing its job. The engine dies because fuel is not getting from the bowl into the engine through the jets, not because something "turned the fuel off." 2) Why won’t it run now when it ran for 30 seconds? This is classic carb-clog behavior. It ran on: • Cleaner fluid • Fuel already in the bowl • Whatever fuel partially flowed before debris moved Then it died because: Most likely causes (ranked in probability): A) Pilot jet or main jet is plugged (MOST COMMON) When varnish breaks loose, it moves downstream and immediately blocks tiny jet openings. Symptoms: • Runs briefly then dies • Won’t restart • Bowl has fuel but engine acts starved • Starter fluid allows momentary run ✅ Fix: Pull carb again and: • Remove pilot jet • Remove main jet • Remove emulsion tube • Spray carb cleaner through everything • Blow with compressed air (not optional) • Pass thin wire through jets if needed Tank vent is clogged → vacuum in tank If the tank cannot breathe, fuel flow stops after a short run. ✅ Test: Remove gas cap and try to start it. If it runs, vent is plugged. C) Vacuum line leaking to fuel pump If the vacuum line is cracked, loose, or plugged, the fuel pump will stop after initial fuel. ✅ Test: Pull vacuum line off pump and crank engine. You should feel strong pulsing suction. No vacuum = hose issue or intake leak. D) Amazon carb quality issue Low-price carbs often have: • Wrong float height • Faulty needle • Leaky bowl • Wrong jet size • Improper gaskets Fuel leaking out the bottom = float/needle defective. ✅ Use the OEM carb you rebuilt after cleaning it again. E) Spark failure after warm-up Much less common, but possible with an aging ignition coil or stator. ✅ Test: Pull spark plug and check immediately after it dies. Spark should be bright blue. A very likely scenario in your case: It ran well → debris moved → jet plugged → bowl stayed full → engine starved → now dead. What I recommend you do next (simple order): Step 1: Remove gas cap and try to start it (rule out tank vent) Step 2: Pull your ORIGINAL carb back off and: • Remove pilot + main jets • Spray + air blast them thoroughly • Make sure spray shoots cleanly out of idle port • Reassemble Step 3: Check vacuum line to fuel pump: Crank with line removed → must feel suction. Step 4: Ignore the Amazon carb for now. Use your rebuilt OEM carb only. Step 5: Verify spark after it dies. I

My guess is knowing Massimo, they never installed it in the first place, that won't be the last problem you have.

How did you test the battery? It must be load tested and I have seen that give inaccurate results. Best to remove and replace if possible. I speak from a recent experience.

I know you have checked it but if not, thats the way batteries fail anymore. Good then they are not.

this makes no sense to me, why would they pass up a big market for a quality SXS EV at a resonable price in the U.S. Some company is going to wake up and make a lot of money (I hope) I thought the Kandi Cowboy was the answer but they seem to have big quality issues.

Wonder if the new Sectors have lithium batteries,and if not, why not?

Not talking, must have bought a massimo.

Your luck has a 99% probability of running out with a Massimo.

Don't get any further from home than you can walk back.

ebay, Amazon

I am seriously considering an AMP also, for general use on a 400 acre farm, so keep the update coming please.

I disagree, you don't get what you pay for.

Be sure to read the view & comments

If anyone is looking for the cheapest UTV, with dump bed, winch, roof and windshield, I just noticed that lowes has the axis 500/ hisun UTV on sale for 4500 (at least in my area) They are $4500. ($9000 original). I have one - they have some issues, but nothing catastrophic. My biggest complaint is that it is under powered. Also the winch failed. They are still selling an extended warranty - which I would take, just in case. My guess is lowes wants them gone.

I'm thinking the gear senser needs adjusting, maybe it thinks its in reverse and the rev limiter kicks in.

good point, perfect is hard to find in anything, especially UTV's.

If you are not happy with a Kubota RTV-XG850 as a work UTV I doubt if you would be happy with any of the others.

ebay & Amazon, it's a crapshoot, certainily no dealer support.

Another way to look at a Massiamte warranty is "there is no warranty" and most Massimo products are very poor quality

So here is my dilemma, I bought a 2014 Massimo MSU500 eleven years ago from TSC, its never been off the farm, had my share of ups and downs with it but never walked back to the house. I have bought a Kubota Sidewinder and it is a fine machine.Problem is I just dont need the Massimo and would like to sell it but the last thing want to do is sell it (cheap) to someone who doesn't realize what a POS a Massimo can be and can't afford to maintain it. I plan to put it of Craigslist with pictures and description, not sure how to warn potiential buyers without scaring them away. I feel like it could be a great buy for the right person or a terrible buy for the wrong person. I'm thinking $2500.

my Massimo had a bad secondary clutch seal which leaked oil onto the drive belt shortly after I bought it, you might want to check yours.

Better save your money for repairs not accessories.

please explain how or why the rear wheels almost fell off, not that I doubt you but sounds a little hoky