Priming M813 fuel system?

[cbvet]

I really need to replace the fuel filter in my M813. The priming pump on the dash is jammed in.
Can I just fill the filter can with fuel before installing?
Any other ideas how to prime?
Can/should I just repair or replace the primer pump? Anybody ever done it?
Thanks for any help guys.
Eric

 

[Hammer]

You can apply a small amount of air pressure to the fuel tank, and let the air out at/near the IP.

But, it is easy enough to FILL the fuel filter up as much as you can, install it, and just start the truck. If it was running before you swap the filter out, it shouldn't be all that big of a deal.

I did it this way without using the primer, and didn't have any issues. But using the air pressure is an easy backup.

 

[cbvet]

Thanks, Hammer.
I thought that would work, but wasn't sure. Heck, I had to get out the manual to find out where the fuel pump is!
I'll work on it today.
Eric

 

[cbvet]

Well, I figured out that the primer pump shaft comes out really easy. "O" rings looked fine, so I oiled them up & the pump works fine. I think it was just dry from sitting.
I filled the filter canister just to save time. Started right up & runs fine.
Thanks again.

 

[WillWagner]

Just keep in mind that when you fill a filter on the Cummins, you are putting unfiltered fuel into the system. There are some class fit parts in the pump that don't like unfiltered dieselgas.

 

[area52]

Someone more knowledgeable than me correct me if I am wrong, but doesn't the priming pump just put fuel in the intake and not actually "prime" the fuel system? I think its just a cold start aid?

 

[Hammer]

Here is what the TM has to say about it.

Primer pressure gauge indicates pressure delivered by hand primer pump during cold
weather starting and used when purging fuel system of air.

 

[bassetdeuce]

Just keep in mind that when you fill a filter on the Cummins, you are putting unfiltered fuel into the system. There are some class fit parts in the pump that don't like unfiltered dieselgas.

That is why I use a small 1 gallon fuel can and pour the fuel into the housing with a small spout. I hold the filter down so that the bottom is sealed against the spring cup, and carefully pour clean diesel between the housing and the outside of the filter.