1970 ford 3400 no fuel to injectors

[bakersfielddriller]

Hi all
I bought a 1970 ford 3400 from a guy moving out of state anyhow he said the tractor had been sitting for a couple of years so i got it home flushed the tank.The lines to the filters all were clear also.I also changed the filters the old ones smelt like kesosene.After that i bleed both filters and the little 5/16th bleeder screw on the pump i think its the pump it has the throttle and kill hooked up to it.Anyhow when i back the little screw out the fuel just trickels out dont know how strong the flow is supposed to be ??.After that i backed off the hard lines one at a time whilw cranking the motor and getting no fuel at any of the three injectors.Dont want to buy a new pump for 600.00 if thats not the problem.If anyone has any ideas please let me know thanks.

 

[Rocky Hoffler]

Since it has been a long has it been since it ran. keep bleeding fuel if you can a trickle if just gravity bleeding maybe ok. Try and start by spraying Silicon in intake. take out air filter first. cranking while spraying and see if it cranks or tries to start by cranking it will help to bleed system do not over heat starter give it a chance to cool off you also will need a hot battery needs to spin over fast good luck.

 

[PILOON]

Break the connections at the injectors and bleed 'til fuel spurts and then tighten lines. If fuel is not getting to injector lines then start back at filter with all lines open and close them as soon as fuel leaks as you work your way from tank up to the actual injector.
Injector pump will not pump air, only fuel so that is why we need to do all this bleeding routine.
Good luck, patience and you'll beat it.

 

[Jerry/MT]

Hi all
I bought a 1970 ford 3400 from a guy moving out of state anyhow he said the tractor had been sitting for a couple of years so i got it home flushed the tank.The lines to the filters all were clear also.I also changed the filters the old ones smelt like kesosene.After that i bleed both filters and the little 5/16th bleeder screw on the pump i think its the pump it has the throttle and kill hooked up to it.Anyhow when i back the little screw out the fuel just trickels out dont know how strong the flow is supposed to be ??.After that i backed off the hard lines one at a time whilw cranking the motor and getting no fuel at any of the three injectors.Dont want to buy a new pump for 600.00 if thats not the problem.If anyone has any ideas please let me know thanks.

Here's note on how to bleed a diesel fuel system. If the tractor has sat for a long period of time, the strainer inthe tank bottom at the fuel out let my be clogged and limiting fuel flow. Check that first then follow the instructions.

Bleeding a Diesel Fuel System


Start at the fuel outlet of the tank (inlet to the filter). Shut the tank valve, remove the line at the filter inlet and holding a suitable container to catch the diesel fuel, open the valve. You should have a CONTINUOUS rush/flow of fuel out of the line. If it dribbles or is intermittent, check the fuel cap for a blockage of the fuel vent or the strainer upstream of the valve for clogging. The strainer/screen is attached to the shut-off valve, and is positioned up inside the tank. You will have to drain the tank and pull the valve to clean the screen.
If you have good fuel flow at that point, reconnect the line and open the bleeder screw at the top of the filter. Turn on the tank valve and wait till you have a steady flow of fuel with no bubbles at the top of the filter, then close the bleeder screw.
Your pump may have a bleeder screw. If so, open that until fuel streams out with no bubbles, then close it. If you cannot identify the bleeder screw, loosen the inlet connection at the pump and purge air at that point.
Go back and make sure ALL the fittings in the fuel delivery system are tight so they cannot suck air.
Make sure the battery is fully charged. Loosen the fuel fittings at the injectors, either one at a time or all at once. Crank the engine till you see all fuel at the injector fittings and then tighten the fittings. If you do indvidual fittings, the engine will usually start before you get to the last fitting.
Alternatively, you can "tow-start" it to save wear and tear on your starter. Leave the injector lines cracked open at the injectors at first to purge the lines. Then tighten them up and she should start.
Your injection pump puts out a very small amount of fuel (high pressure/low volume). BE PATIENT. If the lines are totally empty, it takes a lot of cranking to fill them up.
sixbales & Jerry/MT