jd 300B Injection pump problem

[gtrace]

I am having trouble with my injector pump.. Had the pump rebuilt, reputable shop. still can't get fuel to go through. All new fuel system. Lines,filter,pump and injectors.. Fuel to fitting at in pump. Won't bleed or fill pump. Tractor was sitting had same problem, before having completely replaced fuel system. And had pump rebuilt. Also tryed electric fuel pump to force fuel through same results. Repair shop said they flow tested pump and calibrated it. Any ideas???

 

[msb]

What brand and model # pump ?

 

[Jake Winn]

Youve probably checked this, but is the drive shaft for the pump turning? transfer pump hooked up correctly? electric shut off or manual? If electric, do you have power to the solenoid? Not just voltage, but amperage. You could have voltage, but if there is high resistance you may not have enought amperage to activate the solenoid.

 

[gtrace]

It is electric. ran wire straight from battery. One question I do have, Does it need power all the time or only to shut fuel/eng off? I thought the solenoid would burn up. What I am trying to do is prime the pump/bleed air with out turning eng,like my perkins..Is this my problem? Does the pump have to be turning to take in fuel?

 

[gtrace]

It is a roosa-master model jdb331al2405. Electric shut off. I am tyring to prime and bleed the system before cranking the eng. Is this my problem, does the pump need to be turning to take fuel in. It will not push any fuel out of the bleed screw or the low idle screw. This is how I bleed the pumps on my other perkins engines (2). I figured it would work the same?

 

[JDemaris]

That pump is self-bleeding as long as it has fuel hooked to it, with pressure, or not. As long as that inlet fuel does not have air in it, the pump will bleed itself. It will work just as well with gravity feed fuel, and can also suck fuel to itself with no other fuel pump used - but maxes out at a five-foot lift.
First of all, either you have fuel getting to the pump, or you do not - and that is very easy t check.
In regard to the electric solenoid - all it is - is an electromagnetic coil that takes spring pressure OFF the fuel-metering valve so it can put itself into RUN position. There is no direct mechanical connection. It must be energized all the time - and it's a low amp draw and also sits in diesel fuel - so it's not in any danger of getting hot or buring out.
The injection-pump has its own fuel pump built into the back of it. If there is fuel there, and the solenoid has power, it will pump fuel and bleed itself out.
It often makes things easier to prime the pump before you install it. All you have to do, is hook a 12 volt power source to it, stick a big screwdrive into it and turn slowly while you squirt diesel fuel into the inlet fitting with a hand-held oil-can. That's all it takes.
You can speed up the bleeding process by cracking loose all three injector lines where they attach to the injectors and then crank until you see fuel dripping out.

 

[msb]

A full or nearly full fuel tank will also speed up the bleed process sometimes.Let us know if it primes after reading JDE's post. There is one or two other rare things it could be.

 

[Mike M]

I didn't see any mention of the lift pump on the side of the block or of using the hand lever on the bottom to bleed the air out of the system and make sure after bleed to push the little hand lever back towards block so it doesn't hold up the pump.

The fuel tank should also have a drain on it might be a good idea to drain off the junk from the bottom to save the new pump and make sure the fuel is turned on too.

 

[gtrace]

Thanks for the info guys..I did fill the pump with a squirt can, and then spun the eng over..it took a few times but is finally running. I didn't know the injector pump had its own fuel pump, so I guess it will not go by with out turning the pump, like the perkins will. But thanks again for the help.