marcuswayne 21 Posted March 22, 2023 I have a 1986 Honda Fourtrax 350. I have a question about the fuel system. What dose the fuel cut relay do? Its not hooked to sense the fuel pressure to the carb.. Dose the fuel pump run all the time the switch is on? thanks for your help Mark Share this post Link to post Share on other sites
ATC4ever 1,078 Posted March 23, 2023 Wow i didnt realize they had that in 86, i am curious as well now. Share this post Link to post Share on other sites
shadetree 5,880 Posted March 23, 2023 35 minutes ago, ATC4ever said: Wow i didnt realize they had that in 86, i am curious as well now. all trx350 fourtrax's ( 1986-1989 ) has a fuel cut-off relay. 2 Share this post Link to post Share on other sites
toodeep 1,758 Posted March 23, 2023 It's so the fuel pump will only get power if there is ignition fire. That way if you tipped it on the side and hit the kill switch on the left handlebar the fuel pump would no longer operate. 2 Share this post Link to post Share on other sites
shadetree 5,880 Posted March 23, 2023 19 hours ago, marcuswayne said: I have a 1986 Honda Fourtrax 350. I have a question about the fuel system. What dose the fuel cut relay do? Its not hooked to sense the fuel pressure to the carb.. Dose the fuel pump run all the time the switch is on? thanks for your help Mark the fuel cut-relay works from back pressure so to speak from the carb and engine. it does require power to work, but its on a pressure system, hard to explain. the cut-off relay works off the timing of the engine, it sends a pulse to the fuel pump. 1 Share this post Link to post Share on other sites
marcuswayne 21 Posted March 23, 2023 Thank you very much toodeep and shadetree that make sense. I have wondered how that all worked. I like knowing how things work. Thanks again Mark 1 Share this post Link to post Share on other sites
jeepwm69 7,600 Posted March 23, 2023 19 hours ago, marcuswayne said: I have a 1986 Honda Fourtrax 350. I have a question about the fuel system. What dose the fuel cut relay do? Its not hooked to sense the fuel pressure to the carb.. Dose the fuel pump run all the time the switch is on? thanks for your help Mark @Goober @shadetree Share this post Link to post Share on other sites
jeepwm69 7,600 Posted March 23, 2023 Just now, jeepwm69 said: @Goober @shadetree Well crap, everybody posted while I was away from my computer with this thread pulled up LOL 2 Share this post Link to post Share on other sites
shadetree 5,880 Posted March 23, 2023 2 hours ago, jeepwm69 said: Well crap, everybody posted while I was away from my computer with this thread pulled up LOL how's feel to not only grow older ?..but slower too !..lol. 2 Share this post Link to post Share on other sites
