Isuzu NPR 4HE1 Keeps Losing Prime Lift Pump Replacement Diesel 1999

How to prime your lift pump. Describing symptoms and going through replacement process of the lift pump

[@poormanrentacar268]

Thank you for sharing your issues and solutions ❤. These pin holes are the real culprits.

[@ironore1866]

Thank you for watching!

[@fassnacht]

Thanks. I have a similar problem with an IHI excavator that uses an Isuzu engine. I tried replacing the primer pump first. I revived the engine but it didn't get rid of the air leak problem. Now I'm replacing the whole lift pump like you. You can buy parts cheaply on Alibaba -- made in China, of course, but good quality.

[@dang8134]

What a great video. Kudos, Dan

[@ironore1866]

Thank you for watching Dan!

[@malcolmmiller7280]

Did the truck start ok before? My truck has a long crank time before ignition… (4 seconds cold, 6 when hot) then it fires and runs fine. Havent found any fuel leaks, I’m thinking primer pump maybe? Any input helps.

[@ironore1866]

Would start sometimes but not others with varying crank times.

[@firstname6208]

Did the primer pump fix your problem?

[@firstname6208]

I have same model, fuel drips out the top of the primer plunger, long crank times. New primer only, on the way.

[@rodneyturner4375]

How was the truck running prior to changing the pump? I'm having the same issue with losing pressure.

[@ironore1866]

Rodney, Was running slightly rough. Check the fuel water separator while it is running and make sure air isn't coming in the system. If so check for leaks in the line from the tank.

[@ThingsStuffandjunk]

I'm seeing air in the water fuel separator.

[@EphraemBernard]

I'm interested❤❤