I am having an absolute mare here
After rebuilding my Mitsubishi 4D55 2.3 TD engine, last Saturday I started it up for the first time, the engine was a bit noisy at first until the oil got pumped around, after 2-3 mins it got smooth. I let it get up to temp and ran it for around 10 mins.
I shut the engine off after letting it get up to temp, to take it for its first run. I lowered it off the jack stands, went to start it and now it won't start. It fires up when I put some starter fluid in the air box so I know its a fuel issue. I checked the power plug on my injection pump and I got 5.3v across 2 of the terminals so I *think* its getting the right power (everythings 6V because its old).
I thought it must be airlocked. So I loosened my bleed screw on my fuel filter, and started pumping my primer......after a few attempts I had fuel/air coming out my bleed screw. All good.
I pumped until no air was coming out, just a steady stream of fuel and I tightened the bleed screw back up.
I then started pumping to fill the injector (it says in the book after you tighten the bleed screw, to pump until the primer gets hard/firm) but I pumped and pumped and pumped and the primer wouldn't get firm at all. Took my bleed screw loose and just fuel came out so I know I'm not sucking air in. At intervals I turned my truck over for 10 seconds with my fuel injector line loose and no fuel was coming out of it.
I loosened the screw in the metal supply line going into the injector, I pumped the primer and fuel is coming out, so I know fuel is entering the injection pump.
I tightened that back up, pumped some more and still no firmness.
After some deliberation..I took the fuel return line off the fuel rail and when I pump the primer, fuel is coming out of that pipe (from the injection pump)...is that meant to happen?? I blocked it off with a screw, to cap the hose and I had to take the other side of the return line (going from the injection pump to the fuel tank) off and put another line with a screw capping it off, on there.
With all the exits (return lines) blocked, I started pumping and the return line from the injection pump to the fuel rail with the screw capping it off, ended up splitting (its old) because of the pressure (although the primer still wasn't getting firm) and fuel was dripping out, so at this point I give up for now to ask a few questions.
-Is the fuel meant to come out of the injection pump and into the return lines when you pump the primer?
-Is my timing messed up? (all my marks line up) I don't see how this would make a difference to priming the injection pump and the other problems I'm having.
-Is my injection pump messed up? (its probably 15k miles old)
-Or is there some other problem that I'm over looking?
Thanks for any input/advice
After rebuilding my Mitsubishi 4D55 2.3 TD engine, last Saturday I started it up for the first time, the engine was a bit noisy at first until the oil got pumped around, after 2-3 mins it got smooth. I let it get up to temp and ran it for around 10 mins.
I shut the engine off after letting it get up to temp, to take it for its first run. I lowered it off the jack stands, went to start it and now it won't start. It fires up when I put some starter fluid in the air box so I know its a fuel issue. I checked the power plug on my injection pump and I got 5.3v across 2 of the terminals so I *think* its getting the right power (everythings 6V because its old).
I thought it must be airlocked. So I loosened my bleed screw on my fuel filter, and started pumping my primer......after a few attempts I had fuel/air coming out my bleed screw. All good.
I pumped until no air was coming out, just a steady stream of fuel and I tightened the bleed screw back up.
I then started pumping to fill the injector (it says in the book after you tighten the bleed screw, to pump until the primer gets hard/firm) but I pumped and pumped and pumped and the primer wouldn't get firm at all. Took my bleed screw loose and just fuel came out so I know I'm not sucking air in. At intervals I turned my truck over for 10 seconds with my fuel injector line loose and no fuel was coming out of it.
I loosened the screw in the metal supply line going into the injector, I pumped the primer and fuel is coming out, so I know fuel is entering the injection pump.
I tightened that back up, pumped some more and still no firmness.
After some deliberation..I took the fuel return line off the fuel rail and when I pump the primer, fuel is coming out of that pipe (from the injection pump)...is that meant to happen?? I blocked it off with a screw, to cap the hose and I had to take the other side of the return line (going from the injection pump to the fuel tank) off and put another line with a screw capping it off, on there.
With all the exits (return lines) blocked, I started pumping and the return line from the injection pump to the fuel rail with the screw capping it off, ended up splitting (its old) because of the pressure (although the primer still wasn't getting firm) and fuel was dripping out, so at this point I give up for now to ask a few questions.
-Is the fuel meant to come out of the injection pump and into the return lines when you pump the primer?
-Is my timing messed up? (all my marks line up) I don't see how this would make a difference to priming the injection pump and the other problems I'm having.
-Is my injection pump messed up? (its probably 15k miles old)
-Or is there some other problem that I'm over looking?
Thanks for any input/advice