mack88 Posted December 29, 2022 Share Posted December 29, 2022 1987 mack 350 4V is there a fuel check valve and if so where would it be located. Quote Link to comment https://www.bigmacktrucks.com/topic/70941-fuel-ckeck-valve/ Share on other sites More sharing options...
Mackpro Posted December 29, 2022 Share Posted December 29, 2022 It screws into the side of the fuel injection pump then the fuel return line ( that goes back to the fuel tank) screws into it. Various different styles throughout the years. Most can be re-shimmed to increase pressure. The spring can break or loose tension or the ball and seat can wear and can cause low fuel pressure or hard starting Quote Link to comment https://www.bigmacktrucks.com/topic/70941-fuel-ckeck-valve/#findComment-519298 Share on other sites More sharing options...
Mackpro Posted December 29, 2022 Share Posted December 29, 2022 Also some are some are service-able some are not. Most are in the front port and will have the plastic fuel return line going to them 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70941-fuel-ckeck-valve/#findComment-519299 Share on other sites More sharing options...
mack88 Posted December 29, 2022 Author Share Posted December 29, 2022 Thanks for the info ordered a new one dealer said only 2 left in north america. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/70941-fuel-ckeck-valve/#findComment-519300 Share on other sites More sharing options...
Mackpro Posted December 30, 2022 Share Posted December 30, 2022 1 hour ago, mack88 said: Thanks for the info ordered a new one dealer said only 2 left in north america. Sounds about right . I been waiting for almost 4 months for a set of injectors for a 2009 MP8 . My corporate won’t let us buy aftermarket engine parts due to past issues. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70941-fuel-ckeck-valve/#findComment-519305 Share on other sites More sharing options...
Quickfarms Posted January 1, 2023 Share Posted January 1, 2023 I ordered one today and they show 5 in stock Quote Link to comment https://www.bigmacktrucks.com/topic/70941-fuel-ckeck-valve/#findComment-519475 Share on other sites More sharing options...
mack88 Posted January 3, 2023 Author Share Posted January 3, 2023 maybe this dealer doesn't have full access to the system or just warehouse. Quote Link to comment https://www.bigmacktrucks.com/topic/70941-fuel-ckeck-valve/#findComment-519804 Share on other sites More sharing options...
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