i own a david brown 780 tractor it keeps on stoping on me due to air getting into the fuel this hapens when i ask for more power i dont work her hard but i have 4acre of hay to make i have had to put a new lift pump bowl on ,2new fuel filters, the fuel is cleen but she is sucking air in ,ialways end up bleeding it at the top of the fuel pump do not get air coming out the filter bleed .WHY .this is urgent
2007-07-16 01:46:26 · 6 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
is there a manual priming lever to pressurise the system?
These can leak air into the system when you use them (the O ring gets unsettled and air gets past it)
You can bypass the primer by using a length of fuel pipe and some brass connectors.....go from the tank feed straight to the first fuel filter but first back fill the pipe with diesel using a small funnel then connect it to the filter.
What air there is in the system after that will be naturally bled out. ( if not just undo the last injector nut slightly and let the air out when shes running.)
a good test is to run a fuel line from a Jerry can to the fuel pump on the engine...if it runs fine then the problem is air getting in before the pump.
2007-07-16 02:42:26 · answer #1 · answered by Anonymous · 0⤊ 1⤋
If your fuel system keeps taking air the you have a leak on the suction side of the pump. Between the tank and the pump. Start with the suction tube in the tank and examine lines and fittings forward to the pump. Especially look for wet areas although if the hole is small enough air will go in where fuel won't come out. If the fuel filters are on the suction side of the pump they may not have air in them but could be the source of the problem-O rings, gaskets. Luck
2007-07-16 09:02:46 · answer #2 · answered by Hondu 7 · 2⤊ 0⤋
obviously there is a leak in the system, I would fill it with fuel, let it sit in the sun (get the fuel hot), and watch to see where it leaks from as the pressure builds. This is dangerous, be very careful not to forget about it.... and to release any pressure build up before starting the engine.
Yes, you may have to seal off the fuel cap, a baggie and rubber band will do it.
2007-07-16 08:51:57 · answer #3 · answered by ralphers 3 · 0⤊ 0⤋
sucking air losse conection rubber on filter not sealed properly or muck in fuell tank take tap off bottom clean tap may be muck or water blocking it give it anew blood line tube from top of tank syphon with mouth feed directly to fuel pump if ok problem as explaind
2007-07-19 16:00:37 · answer #4 · answered by ken p 5 · 0⤊ 0⤋
did you replace your pickup tube before the lift pump? sometimes they develop a crack and will suck air there, not allowing proper fuel pressure... or sometimes they swell almost shut. try replacing the pickup tube with a slightly larger new one.
2007-07-16 08:54:37 · answer #5 · answered by darrin b 4 · 0⤊ 0⤋
Do you have a float bowl on the tractor? if so the pin is stuck in the bowl. Take the bowl apart and get a new float pin from the local tractor supply and replace it. Once they start sticking there isnt much you can do to fix it.
2007-07-16 08:57:12 · answer #6 · answered by Yes I am here!! 5 · 0⤊ 3⤋