Re: Injectors on old Detroit 3-53

Posted by NC Wayne on October 11, 2004 at 20:32:03 from (152.163.100.72):

In Reply to: Injectors on old Detroit 3-53 posted by salsanta on October 11, 2004 at 19:29:51:

You say you ran out of fuel and now it seems to have lost all power. Sounds to me like you could have a stuck injector. The fuel acts as a lubricant for the plungers in the injectors. If the fuel flow stopped the the injectors lost their only source of lubrication and one or more of them may have siezed. The way the rack is designed in a Detroit if one of them siezes at any point in the throttle range then none of them will be allowed to go past that point. This usually results in an engine that will start and go to that particular throttle level and then won't shut down with the fuel stop alone. However I have seen them where they will shut down but are weak when run, it just depends on wether the plunger is completely siezed in both directions or wether it's siezed to where it just won't rotate past a certain point when throttled up. Beyond that the a Detroit has a positive displacement gear pump for the fuel transfer pump so with everything right it should built pressure in the injectors without any problem simply by cranking the engine. One thing that I often see is that Detroit origionally put an orfice in the return side of the fuel system to help build fuel pressure instead allowing it to "free flow" and over the years it gets left out for one reason or another. If that orfice is missing it can cause a problem getting the system to prime, or if the fuel pump is simply worn out it can cause the same problem. In a case such as this I always take loose the fuel line coming out of the pump and the return line back to the tank an. Using a seperate jug of fuel I then hook it up to a small electric pump and let it prime til the fuel starts flowing out of the return line. Once you have flow hook everything back up quick and start the engine. I've never had this trick to fail. Good luck.

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