Primer pump leaking any ideas??

[Steamynachos]

Well I changed my fuel filter and tried to prime the fuel system as stated in the TM. well all i get is air in the line now it seems that my primer pump on the dash lets air into the line when I pump it does anyone know what size rubber grommets are on the pump I have some that looked right the but I cant get them to fit in the tube of the pump and it still leakes when I tried the next size down

 

[WillWagner]

What kind of engine is it? Can you post a pic of the priming pump. If it's a cummins 220, 749 or 855, it's only 2 o-rings on the shaft. Sorry, don't know much about the 5 ton, just clicked here by mistake, but i do know cummins.

 

[70deuce]

Repaced Cummins 250 primer pump O-rings

Finally had to replace the two O-rings on the dash mounted primer pump. Not the greatest pictures of the assembly but you can see why I had diesel dripping off the plunger. Note the O-ring split. 36 year old O-rings tend to do this. Very easy to replace. 5 minute job and cheap repair. The size of the rings are 3/8" ID, 1/2" OD x 1/16"wall. Got mine at Lowes # 0562. M809 Unit Maitenance TM 9-2320-260-20 page 3-62 shows how to dismantle it. !972 M818 was the patient.

 

[70deuce]

Forgot the pics!!!

 

[70deuce]

try again

 

[Repo3004]

what section at Lowe's did you find the O-Ring, thanks for this write up. I need to do the same thing to mine.

 

[MyothersanM1]

There in the plumbing department. Got mine there also. Post any pics of your 818 Shorty yet?

 

[Repo3004]

Thanks, for the reply