Rubberman 10 #1 Posted Friday at 06:15 PM Have a 312-8 Wheelhorse with the M12 engine. I replaced the carb with a clone. Added an electric fuel pump and fuel pressure regulator (set at 1 psi). had this setup for a while but now it won't run anything highter than an idle. It starts choking out and backfiring.Even at idle if I try to engage deck it will die. I just cut half the backyard and ran fine then this hit. Any adjustments to the low and high speed needles makes it run worse. Adjustments to fuel pressure regulator make no difference. thoughts ? Share this post Link to post Share on other sites
pfrederi 18,638 #2 Posted Friday at 06:39 PM Dirt in the carb need to thoroughly clean it and your fuel lines. Some clone carbs do not run well... 2 1 Share this post Link to post Share on other sites
Handy Don 13,982 #3 Posted Friday at 06:41 PM 1 minute ago, pfrederi said: Some clone carbs do not run well Some come pre-dirtied. 2 Share this post Link to post Share on other sites
Rubberman 10 #4 Posted Friday at 07:53 PM I left it alone for a bit. Adjust the low speed 2 turns out , hi speed 1.5 turns out and ran fine. No issues at all. I don’t know Share this post Link to post Share on other sites
pfrederi 18,638 #5 Posted Friday at 07:59 PM The dirt relocated...if your lucky it will stay relocated...but... 3 Share this post Link to post Share on other sites
ri702bill 9,351 #6 Posted Friday at 10:55 PM 2 hours ago, pfrederi said: The dirt relocated...if your lucky it will stay relocated...but... And that folks is what you call "Foreign Matter" where it matters.... 1 Share this post Link to post Share on other sites
kpinnc 14,587 #7 Posted Saturday at 05:14 AM 10 hours ago, Rubberman said: It starts choking out and backfiring.Even at idle if I try to engage deck it will die. Dump the sediment bowl. Even if moving the needle valves cleared it up, the bowl may still have crud in it. 2 Share this post Link to post Share on other sites
peter lena 9,235 #8 Posted Saturday at 12:27 PM @Rubberman regularly refer to running in a used engine on a separate gallon of heavily treated fresh fuel , always drop carb bowl , another consistent issue is rubber hose break down , since going over to FUEL STA BIL , in all my stuff , every filter is clean and clear , and fuel bowls are clean and clear , also have a couple of carbole electric pumps . very solid , no issues . realise the fuel issue is very argumentative , did my own trying / testing , have zero fuel related issues , since making the change , pete 1 Share this post Link to post Share on other sites
peter lena 9,235 #9 Posted Sunday at 12:41 PM @kpinnc always look at a chronic issue , as a perfect opportunity to make that trouble free. look at what it is SAPOSED TO DO . very often , looking at every stage , and making it better . changes are so close , you initially , don,t even see them , but if they make it consistently reliable , isn't that what you want ? like a roller stool , for a visual , hands on idea trial . another thing I have added to choke throttle linkage , is very light spring assist , to lubricated linkage , also insure related cabling , is lubricated , and slides with out effort , super lube , hydraulic oil / spray , check out temp range , extreme . always look at a members pictures , and see a related spot / area , that I changed out , eliminated a chronic area , that has been working with for issues for years. just the way I look at things , retired 24 / 7 millwright , pete 1 Share this post Link to post Share on other sites
953 nut 59,789 #10 Posted 15 hours ago Have you been using gasoline that has ethanol in it? If so, STOP. That junk gas will cause problems with your fuel system. To find a station that sells non-E-gas use this website . https://www.pure-gas.org/ Share this post Link to post Share on other sites
