Kubota B7510 Lift Pump

[fireball71149]

I replaced the lift pump but still do not get fuel from the output side of the new pump.
I am getting fuel to the input side of pump.
Any help would be appreciated.
Richard

 

[thepumpguysc]

You ARE talking about a supply/lift pump, right??>> NOT the injection pump..
Unless the cam lobe is worn to the point that its not actuating the lift pump rod.. that seems impossible..
Its just a silly diaphragm pump w/ a rod to make it move..
Did you test it before you installed it??
You could say "the heck w/ it" & install an electric pump..??
I've never heard of such a problem.. Now if we're talking INJECTION PUMP.. that's a VERY common problem..

 

[fireball71149]

I tried to respond yesterday but couldn't get to post for some reason. It is the lift pump and not the injection pump. It was suggested to me by a friend today that if the battery was weak it might not be turning the cam fast enough.

 

[Mendonsy]

On the B7500 (and probably the B7510) there is a return line from the injectors that connects into the injection pump. If that return line has a spit in it the injection pump will draw air instead of fuel. It happened to my B7500 and was a real PAIN to find.

 

[Leejohn]

I tried to respond yesterday but couldn't get to post for some reason. It is the lift pump and not the injection pump. It was suggested to me by a friend today that if the battery was weak it might not be turning the cam fast enough.

Did you buy what your friend said?

 

[thepumpguysc]

The RPM will have an effect on STARTING but not on lift pump activation.. I can/you can, make the LP work w/ your hand on the work bench..
Why not pressurize the fuel tank w/ a little air inorder to get the fuel up to the inj. pump..??
Leave the banjo bolt connector loose AT THE INJ. PUMP, pressurize the tank till you get fuel & tighten the bolt back down..
Loosen the lines AT THE INJECTORS & crank till you get fuel UP THERE, then tighten.. Its called bleeding the air from the system..

 

[fireball71149]

Will try and see if it will work. Thanks for your help.

 

[DwayneB]

It's darn hard to get em primed sometimes. I usually just give up and pull it with another tractor.

 

[fireball71149]

Dwayne I might have to do the same.

 

[fireball71149]

I jumped the tractor off of my truck and turn it over several times and the pump primed. Thanks for the input now to bleed the injectors.