Quickfarms Posted October 17, 2021 Share Posted October 17, 2021 Can you replace just the shaft seal? I have one that drips and I would rather just replace the seal than draining the tank and replacing the entire valve. Quote Link to comment https://www.bigmacktrucks.com/topic/68497-fuel-leveling-valve-shaft-seal/ Share on other sites More sharing options...
Popular Post Joey Mack Posted October 17, 2021 Popular Post Share Posted October 17, 2021 ok,,,, get the fuel level to about half a tank, have both valves shut off, on hook the hose at the bad valve, have the new one ready with a good dose of thread sealer on it, break the bad fitting loose then snug it back up lightly. Now get a helper and a shop vac, have the helper hold the shop vac over the fill hole tightly,,, then let suction build up for a few seconds. once this is done, keep the vac going, and swap the fitting.... the vac will suck air into the bung where the fitting goes, this will allow you to change the valve with little mess... this also works for replacing coolant sensors... jojo 2 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68497-fuel-leveling-valve-shaft-seal/#findComment-481476 Share on other sites More sharing options...
fjh Posted October 17, 2021 Share Posted October 17, 2021 (edited) 33 minutes ago, Joey Mack said: ok,,,, get the fuel level to about half a tank, have both valves shut off, on hook the hose at the bad valve, have the new one ready with a good dose of thread sealer on it, break the bad fitting loose then snug it back up lightly. Now get a helper and a shop vac, have the helper hold the shop vac over the fill hole tightly,,, then let suction build up for a few seconds. once this is done, keep the vac going, and swap the fitting.... the vac will suck air into the bung where the fitting goes, this will allow you to change the valve with little mess... this also works for replacing coolant sensors... jojo The other option you may have! is to back the gland nut out and stuff It with a leather shoe lace around the tap shaft and re install the nut just something to try if its leaking around the tap shaft! DO IT When the tank is low! Edited October 17, 2021 by fjh Quote Link to comment https://www.bigmacktrucks.com/topic/68497-fuel-leveling-valve-shaft-seal/#findComment-481480 Share on other sites More sharing options...
Quickfarms Posted October 30, 2021 Author Share Posted October 30, 2021 I emptied the tank today and replaced the valve with a NOS valve, all this for a stupid o ring that you can’t replace when there is fuel in the tank Quote Link to comment https://www.bigmacktrucks.com/topic/68497-fuel-leveling-valve-shaft-seal/#findComment-482140 Share on other sites More sharing options...
Joey Mack Posted October 30, 2021 Share Posted October 30, 2021 yep.... it's all good right? jojo Quote Link to comment https://www.bigmacktrucks.com/topic/68497-fuel-leveling-valve-shaft-seal/#findComment-482143 Share on other sites More sharing options...
Phase 1 Posted November 2, 2021 Share Posted November 2, 2021 It appears the seal that is leaking is on the shaft. Quote Link to comment https://www.bigmacktrucks.com/topic/68497-fuel-leveling-valve-shaft-seal/#findComment-482288 Share on other sites More sharing options...
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