I've been troubleshooting this for 3 days now and am to the point I know I need to bleed the fuei line, but I can't find a valve anywhere. I know pressure is good at 100 psi on the incoming line to the filter. Haven't tested on the outgoing. No smoke from the exhaust at any time.
I take it you have a crank no start issue, the fuel is injected by high pressure oil, no oil pressure no start, there are 2 oil pumps, low lube pressure and high injection control pressure (ICP) the injection system is hydraulic controls electric actuated fuel injection, if when you crank the engine over and the oil pressure guage goes up base pressure is ok, then its high pressure or the best thing I can say is pull codes and that can give me a good direction to send you in, there are many things that can cause that problem, if the fuel heater shorts out, the pcm and it are on the same 30amp circuit causin the same problem and still you would have proper fuel pressure readings.
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we dont have this engine here, USA.
but i have the WG jeep book,
starting page 12 , chapter 14
FUEL INJECTION PUMP BLEEDING
(1) If the fuel injection pump has been replaced,
air should be bled at the overflow valve before
attempting to start engine.
(a) Loosen the overflow valve (Fig. 18) at the
rear of the injection pump.
(b) Place a towel below the valve.
WARNING: WHEN CRANKING THE ENGINE TO
BLEED AIR FROM THE INJECTION PUMP, THE
ENGINE MAY START. PLACE THE TRANSMISSION
IN NEUTRAL OR PARK AND SET PARKING BRAKE
BEFORE ENGAGING THE STARTER MOTOR.
CAUTION: Do not engage the starter motor for
more than 30 seconds at a time. Allow 2 minutes
between cranking intervals.
(2) Crank the engine for 30 seconds at a time to
allow air trapped in the injection pump to vent out
the fuel injector drain tubes. Continue this procedure
until the engine starts. Observe the previous WARNING
(3) Tighten overflow valve.
HIGH-PRESSURE FUEL LINE BLEEDING
WARNING: THE INJECTION PUMP SUPPLIES HIGH-
-PRESSURE FUEL OF APPROXIMATELY 45,000 KPA
(6,526 PSI) TO EACH INDIVIDUAL INJECTOR
THROUGH THE HIGH-PRESSURE LINES. FUEL
UNDER THIS AMOUNT OF PRESSURE CAN PENETRATE
THE SKIN AND CAUSE PERSONAL INJURY.
WEAR SAFETY GOGGLES AND ADEQUATE PROTECTIVE
CLOTHING AND AVOID CONTACT WITH
FUEL SPRAY WHEN BLEEDING HIGH-PRESSURE
WARNING: DO NOT BLEED AIR FROM THE FUEL
SYSTEM OF A HOT ENGINE. DO NOT ALLOW FUEL
TO SPRAY ONTO THE EXHAUST MANIFOLD WHEN
BLEEDING AIR FROM THE FUEL SYSTEM.
Bleed air from one injector at time.
(1) Loosen the high-pressure fuel line fitting at
the injector (Fig. 19).
(2) Crank the engine until all air has been bled
from the line. Do not operate the starter motor
for longer than 30 seconds. Wait 2 minutes
between cranking intervals.
(3) Start the engine and bleed one injector at a
time until the engine runs smoothly.
pump timing is on next page
or tank filter line priming before. above.
Close the filter drain cock, remove the filter, fill the filter with fuel and put it back on. Now crank the engine to start at a faster speed and let it blubber till it smooths out and your good. If you\'ve been cranking on it already, hope not, then you have allowed air into your fuel system and you must bleed all the air out at the injector lines until there is fuel coming out of each line you\'ve got cracked open at each injector. It will take some time and a lot of cranking. But if you do it like I said to start with, it will start easily. I\'m an old timer and love diesel engines. Old school way is the only way.
I don't know a lot about these trucks but I can tell you that somewhere between the spin-on fuel filter and the I.P. (injection pump) is a 1.5" dia X 4" long steel primer. Just under the top of it is a spring. You will need to loosen or open the "Fuel supply line", at the I.P. (going from the filter, to the pump) and manually pump the fuel primer. Continue pumping the fuel primer until diesel flow from the opening. Quickly close off the drain-port or fuel-line, pump the primer a few more times (to increase line pressure and try to start your vehicle. After it starts, check for leaks. Let me know if I can help anymore. Good luck.
First thing to try with any diesel that won't start is to do a diesel system bleed. This one should be before the HP fuel rail type so start by bleeding the lift pump, then the fuel filters, then the main injector pump to lines to the injectors and lastly the injectors. Good luck.
Most likely you just have air in the lines.Crack them open one at a time and bleed them with the fuel pump off and on till you get fuel.If it fires dont hit the throttle let it sit and idle and close the line.Does it fire up with a small whif of starting fluid?
Hi Peter, If the vehicle turns on the starter all the time, and sometimes starts and other times fails, check the fuel filter for leakage. Sometimes air gets into the fuel system. When it gives problems, open the bonnet (hood) and have someone pump the pump on top of the filter housing. If it feels soft when beginning to pump, I would suspect either a leakage on the fuel line or the filter housing. If you need to replace the housing and filter, remember to fill the replacement filter with clean diesel fuel first. the glow plugs can also cause problems if one or more have burned out. Regards John
This is not unusual on a diesel. What happens is there is air in the system. If this vehicle has an electric fuel pump loosen line where fuel enters injection pump then turn ignition key to the on position and watch for fuel to appear and then quickly tighten line before turning off key. Then try to start. If does not have electric fuel pump will need a second person. One will loosen line and watch while other cranks vehicle until you get fuel and tighten line before the other person releases ignition switch unless vehicle starts first. If that doesn't do the job do this where line hooks onto each injector. Probably will not have to do this to all injectors but could run rough until all the air gets out of everything. I have farmed with diesel tractor for 25 years and dad I drove the gm vehicles with the 5.7. You normally don't start a diesel without bleeding the air out of the lines although some will self bleed most won't. Hope this does the trick.
just bump the ignition without starting it let sit for 20 seconds oruntill you hear lift pump shut off then shut off ignition and repeat do it 2 or 3 times should start then cummins is a self priming system has been for years even in semi trucks