skydawg Posted September 20 Share Posted September 20 My lift pump doesn`t have a hand primer.I replaced lines and the cartridge in the secondary filter.Can I prime the system with air to the fuel tank without opening any lines going to the injection pump? Thanks. Quote Link to comment https://www.bigmacktrucks.com/topic/74569-endt-673-fuel-priming/ Share on other sites More sharing options...
glenbjackson Posted September 20 Share Posted September 20 (edited) i have not tried this but if you cover any vents/holes ..... possibly yes. try it!! fueling is more easily diagnosed with a hand pump at pickup pump AND one down near tank. i have added little hand primers to all my trucks at pickup pump(on injection pump) and next adding another down near tank. any patching to get going on side of road may need system priming. i have this setup on my CM currently and a leaky hand priming pump left me stranded once. very very old plastic hand primer pump was replaced and after trying to pull on a dryish??\open system through filters didnt work out. which i thought that was the purpose of a hand priming pump but hey ive learned. although could have been other leaks in the systems or even quality of replacement hand pump. whatever the case i say just install two hand pumps, call it a day. Or maybe moving tank to same side as injection pump, closer may help idk. Edited September 21 by glenbjackson Quote Link to comment https://www.bigmacktrucks.com/topic/74569-endt-673-fuel-priming/#findComment-558831 Share on other sites More sharing options...
skydawg Posted September 23 Author Share Posted September 23 Can the lift pump in an ENDT 673 ever be in a "closed" position? I`m trying to prime the system w/ 10 lb of air into the fuel tank,vent blocked.I have the inlet fitting at the injection pump open,but after 10 min of compressed air,still no fuel at the IP.I filled both fuel filters when installing,but that was 2 wks ago.Maybe the scraper filter before the lift pump drained back into the tank.Is it safe to use more than 10 lb of air.I can`t see that it would matter,if I leave that inlet open at the IP.Thanks. Quote Link to comment https://www.bigmacktrucks.com/topic/74569-endt-673-fuel-priming/#findComment-558963 Share on other sites More sharing options...
Joey Mack Posted September 23 Share Posted September 23 it sounds like the fuel pick up line is clogged, take the fitting off and see what comes out, a milk jug makes a good catch can.. Quote Link to comment https://www.bigmacktrucks.com/topic/74569-endt-673-fuel-priming/#findComment-558968 Share on other sites More sharing options...
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