I have a Honda 20 hp v twin engine in a utv. I have to spray starting fluid in it to start. Runs fine after that. Next day, I have to spray starting fluid to get it to start again. What is up ?

try replacing fuel injection fuse.

When this happens have a can of spray starting fluid on hand, spray it into the engine air intake, if the engine starts you may have a failing electric fuel pump

Many cars nowadays have sensors built in to make then run economically and reduce pollution. If you start you car for very short runs, after a while these sensors become fouled, and/or they shut down to protect the engine.

Without diagnostics, I can't say exactly what the problem is but, I would suggest the next time you start the car, you give it a good run and get the engine good and hot to burn of any deposits stuck inside. (about 40 miles). Assuming this works, give you car a good run, 20 minutes, at least once a week.

The likely cause of this is a defective electric fuel pump, to verify buy a can of spray starting fluid at the parts store, next time it won't start remove the air hose to the engine and spray the starting fluid in, if it starts you will need to replace the fuel pump. The fuel pump is located inside the fuel tank, about a 3 hour job to replace.

This sounds like a weak fuelpump, and take a while to build up pressure, the starting fluid get the engine running until the pump builds up pressure, i would have the fuel pressure tested and i think you will find that its bad. good day.

Spray starting fluid into the engine, does it start? if so you need to replace the fuel pump.

if it runs when spraying starting fluid in it, then the most likely problem is no fuel getting to engine. check or replace fuel filter, check the fuel pump fuse and relay it may have blown. if not that see if fuel pump is working. to check pump--- have someone turn car to on, while you feel for vibration at fuel tank under car. a fuel pump only comes on for a few seconds to get the fuel to engine. but when started it runs continuously. have a good day !!

first thing i would do i would check fuel pressure if you have good fuel pressure then the next thing i would unbolt the exhaust from the exhaust manafold and then try to start engine if the engine starts up and runs fine then you have clogged up exhaust converters

terry - Master tech

What engine? 4 or 6. Do you mean it will turn over but not start?