Fuel pump bad?

[dniksich]

Just had the injection pump rebuilt on a 2010 L4400 and installed it but when trying to bleed it, only got a little fuel out of the 2&3 injector lines but nothing from 1&4 so I decided to check flow from the pump. Pulled the outlet line and got very little flow while cranking. Pulled the inlet line and got good flow so I'm assuming it's a bad pump? Mechanical pump by the way. I'm more of a car mechanic and I'd say pump for sure but with these, I figured I'd ask to be sure. TIA

 

[GreensvilleJay]

bad pump, plugged filter, crud in tank......

Start at tank ,then go forward, when flow stops you'll KNOW what the cause is...

 

[dniksich]

bad pump, plugged filter, crud in tank......

Start at tank ,then go forward, when flow stops you'll KNOW what the cause is...

It gets great flow to the inlet of the pump but very little while cranking on the outlet side going into the injection pump. Guess it is a bad lift pump. Thanks

Just pulled it and when I push the plunger I only hear oil squeezing out from around it. I also can blow through the pump both directions....guessing this shouldn't happen?

 

[North Idaho Wolfman]

It gets great flow to the inlet of the pump but very little while cranking on the outlet side going into the injection pump. Guess it is a bad lift pump. Thanks

Just pulled it and when I push the plunger I only hear oil squeezing out from around it. I also can blow through the pump both directions....guessing this shouldn't happen?

Replace the lift pump.

 

[dniksich]

Replace the lift pump.

Thanks, sorry for the simple questions. Just learning the diesel engine stuff. lol

 

[North Idaho Wolfman]

Thanks, sorry for the simple questions. Just learning the diesel engine stuff. lol

Nothing's too trivial, every part matters.
Just as a note: Don't blow air in the fuel system pats like a pump as it just blows out the diaphragm.
So if it wasn't bad before you "tested it" it will be after.

 

[dniksich]

Nothing's too trivial, every part matters.
Just as a note: Don't blow air in the fuel system pats like a pump as it just blows out the diaphragm.
So if it wasn't bad before you "tested it" it will be after.

Lol. Just used mouth pressure. Definitely not compressed air. I’m gonna get a new pump and hope this does fix it. I’m sure it will.

 

[DustyRusty]

I have heard of bad breath, but never it is bad enough to kill a fuel pump by just blowing into it.

 

[dniksich]

Thanks for the help! Put the new pump on and it's running great now!

 

[North Idaho Wolfman]

Thanks for the help! Put the new pump on and it's running great now!

Excellent to hear!