Re: Detroit 3-53

Posted by tlock0331 on December 19, 2015 at 07:18:32 from (107.77.89.117):

In Reply to: Detroit 3-53 posted by Blueboy on December 18, 2015 at 20:38:41:

blueboy,

I read through some of your thread on heavy equipment, didnt finish, it drifted quick lol.

I apologize if i say something you already know, im not trying to belittle or anything.

You stated you changed everything prior to running it after it sat for 15 years. Fuel lines & filters and now you have bubbles in your return side. So, i would start by checking all your filter gaskets, then resnug your line fittings. You didnt say if there was a check valve in the line or not.

If after that you still have bubbles in your return then from beginning to end, the fuel pump has a suction side and a discharge side. if you have bubbles in your return line, the only way i can think that would happen would be from the suction side. That being said, the supply side should have a check valve on it to keep the suction side full and not have to spend extra battery juice to spin it to refill the line. You more than likely wont see a leak on this side since it would be pulling air in, causing bubbles in your return, and when its off it would leak back to the lowest points collectively. All of my detroits have 2 filters and each set up a little differently, so if one of them is the highest point of your fuel system, i would look at it first it could be as simple as a bad gasket, loose pipe plug or fitting.

From the pump forward everything is under pressure, which would cause fuel blowing out and you would see bubbles somewhere else in the system. I would think if you have an injector problem you would see diesel in the oil since when not running, the fuel rail and bowls would leak at the crack and drain down. Since everything is under pressure from the pump forward my money would be on the suction side of the fuel system.

You said when you pinch down the return line the bubbles go away, i dont know how long you are pinching the line, but the only way to know for sure that you are eliminating the bubbles would be to pinch the line while in a bucket of diesel and let it run for at least 5 to 10 minutes, cause you could only be masking the problem, a little more backpressure would cause the line to pack the air a little more building up somewhere and then still coming out, just not venting to atmosphere as quick as your used to seeing. Just cause you dont see the bubbles for a second to two doesnt mean they have gone away.

If you think you have a fuel problem at the injector, get you a hammer and while its running with the valve cover off, take your hammer handle and push down on the injector and see if the motor runs any different. Since you have talked about pulling the injectors i am guessing you know how to set them afterwards so ill skip that. the rack doesnt contain any fuel, its only purpose is to allow more or less fuel, since its under pressure so i dont think that has anything to do with it.

Others are correct though, if your not making that detroit scream your doing something wrong, a screaming detroit is a happy detroit - haha

Sorry for the book i wrote, i just wanted to be complete in my thoughts and not offer a 1 line response. Keep in mind this is just my less than professional opinion. please let us know what you find so you can helps others out.

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