R Jack Posted January 15, 2016 Share Posted January 15, 2016 I have a 2006 Mack Vision, I have trouble with loosing fuel in the fuel pro 382. I have cleaned check valve, replaced check valve, changed o rings on cap and base. Have to add fuel to it soon as it sits a couple days, and prime. Anyone have solution for me. Quote Link to comment https://www.bigmacktrucks.com/topic/43527-fuel-problems-with-fuel-pro-382/ Share on other sites More sharing options...
mrgumby Posted January 16, 2016 Share Posted January 16, 2016 can you see any visible leaks check valve leaking is it mounted higher than fuel tank just some ideas Quote Link to comment https://www.bigmacktrucks.com/topic/43527-fuel-problems-with-fuel-pro-382/#findComment-320131 Share on other sites More sharing options...
R Jack Posted January 16, 2016 Author Share Posted January 16, 2016 There are no visible leaks, Can leave it in shop for 3-4 days and don't find no leaks, I have cleaned check valve replaced check valve, and it is higher than fuel tank. Would there be a check in fuel tanks?? Quote Link to comment https://www.bigmacktrucks.com/topic/43527-fuel-problems-with-fuel-pro-382/#findComment-320136 Share on other sites More sharing options...
mrgumby Posted January 16, 2016 Share Posted January 16, 2016 (edited) Loss of Prime:When air is introduced into the fuelsystem, (iedraining water from the Fuel Pro or whenreplacing the fuel filter) a check valve is needed tokeep the fuel system primed from the Fuel Pro backto the fuel tankA check valve is standard with everyFuel ProATo test for proper check valve operation,remove the fuel inlet hose and open the ventcapFuel should not flow out of the Fuel Pro,although a slight seepage of fuel is normalBIf fuel drains back to the fuel tank, remove thecheck valve assembly at the fuel inlet fittingDisassemble the check valve assemblyCleanand inspectReplace the assembly if any cuts,grooves or nicks are evident in the ball or bodyseatReinstall the check valve assembl Edited January 16, 2016 by mrgumby Quote Link to comment https://www.bigmacktrucks.com/topic/43527-fuel-problems-with-fuel-pro-382/#findComment-320212 Share on other sites More sharing options...
mrgumby Posted January 16, 2016 Share Posted January 16, 2016 usually thats a sign of the check valve leaking back to the tank.. is the check valve between the tank and filter... is the gasket for the filter housing tight .... i have seen the locking ring get cracks in it and not seal properly.... Quote Link to comment https://www.bigmacktrucks.com/topic/43527-fuel-problems-with-fuel-pro-382/#findComment-320216 Share on other sites More sharing options...
R Jack Posted January 17, 2016 Author Share Posted January 17, 2016 Check valve is between filter and tank, I will double check ring for cracks, when I put it back together it seemed to tighten down good. Will double check this next week.Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/43527-fuel-problems-with-fuel-pro-382/#findComment-320303 Share on other sites More sharing options...
cxn613 Posted January 22, 2016 Share Posted January 22, 2016 Did you replace ball and seat check valve that is in the davco? Quote Link to comment https://www.bigmacktrucks.com/topic/43527-fuel-problems-with-fuel-pro-382/#findComment-321012 Share on other sites More sharing options...
Jasleep Posted April 14, 2021 Share Posted April 14, 2021 Did you ever figure it out? I have the same issue on a 2014 Pete 587. I've replaced o rings, check valve, seal on bottom plate, all my fuel lines. Quote Link to comment https://www.bigmacktrucks.com/topic/43527-fuel-problems-with-fuel-pro-382/#findComment-472487 Share on other sites More sharing options...
JB7 Posted December 26, 2022 Share Posted December 26, 2022 1 - The Davco test in the manual available online (pg 19 for Model 382) states that slight seepage is normal when testing the check valve. A little seepage can add up over several days. 2 - Davco states to use a thread sealant when installing the check valve and torque to 44-60 ft-lb. 3 - All it would take would be a spec of dirt or sand to get between ball and seat to cause drainage. Maybe crud coming out of the tank. Or check for any fine particles in the base and blow out with brake clean and compressed air. Doubt it but there may be corrosion in the base or crack. If no external leak the only place it can drain is back through the check valve. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/43527-fuel-problems-with-fuel-pro-382/#findComment-519108 Share on other sites More sharing options...
Joey Mack Posted December 26, 2022 Share Posted December 26, 2022 You posted on an old post... No biggie.. welcome to the Dog House 🏡... Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/43527-fuel-problems-with-fuel-pro-382/#findComment-519110 Share on other sites More sharing options...
JB7 Posted December 27, 2022 Share Posted December 27, 2022 Another thought. Davco recommends draining the water from the bottom of the unit once a week. If this is not done the base can get corroded internally. All it would take is a little bit of that corrosion to break off and get between the check valve ball and seat. The result being fuel leaking out of the unit back to the line or tank. Quote Link to comment https://www.bigmacktrucks.com/topic/43527-fuel-problems-with-fuel-pro-382/#findComment-519162 Share on other sites More sharing options...
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