Get to know your Injectors

2020, Gauges, Injectors -

Get to know your Injectors

Injector cups, tips, sleeves, and tubes; there is some confusion in the industry about what these parts do and where they are. Injector cups are mounted on the injector. It is where the injector plunger compresses the fuel and injects it into the combustion chamber.  The cup, sometimes called the tip, is at the bottom of the injector and has the small holes, about .008 diameter, and atomizes the fuel and works in conjunction with the plunger.  Years ago when building the injectors for the Big Cam Cummins engines we would lap the plunger into the cup so when the fuel was injected there would be no fuel bypassing the plunger and traveling back up into the body of the injector.  The body of the injector holds the O-rings.  Cups and tips are the same item. Now the injector tube, or sleeve, is made from steel or copper and seats into the head to hold the coolant back from the injector.  The injector assembly seats onto the injector tube and has an O-ring on the outside diameter to aid in sealing off the coolant.  Most injector tubes  must be set to allow for the correct injector tip (cup) protrusion.  If the protrusion is too high the injected fuel will be above the bowl of the piston and the result will be excessive smoke.  If you had a new head or injector tubes (sleeves) installed and now have a smoke problem, please tell us everything you had done to the engine.  When the head is on the engine the only way to check the injector tip or cup protrusion is to remove the head.  Injector cup, tip, protrusion is very important.       

Boost gauges - If your boost gauge is reading anything other than zero when the truck is idling then your boost gauge is broken and you will need to be replaced. Oftentimes the spring can become damaged and give a false reading. As you may know, the boost gauge is a vital instrument for your truck. Watching it will not only help you gain fuel mileage, but it can help diagnose issues as well. It’s much easier for us to quickly diagnose a truck when it’s equipped with a boost gauge. Here at Pittsburgh Power we offer high quality Hewitt Industries gauges which are some of the most accurate in the industry. We’ve been selling them for decades and have proven reliable. These gauges only cost $92.97 and are very easy to install. They come with the necessary line and adapters. Just run the line to your manifold and wire up the gauge for the backlight, that’s it! 

Good news for Max Mileage FBC users. We wanted to find a way to lower the cost to you, the consumer, for Max Mileage so we came up with a subscription program. Our solution not only saves you money but is more convenient as well. The subscription program allows you to have Max Mileage delivered to your door every 30, 45, 60, 75, or 90 days. You no longer need to remember to order every other month, it just arrives right on time. You can even go on our website to adjust the frequency or skip a month if needed. And the best part is you get free shipping! We benefit from being able to better project demand and that allows us to pass the savings on to you. Just visit our website, to get signed up.


Deleting the emissions system on your truck is always a bad idea. Every day we get calls and messages from owner-operators asking where they can find a delete kit or if we can delete their trucks. Our answer will always be no, and that’s not just for our sake, but for yours too. Deleting your truck probably will be worse for your business in the long run. Firstly, deleting a modern truck will often lead to other problems. The emissions systems are so integrated into the truck’s programming, they will often run worse than just leaving it stock. In addition, most delete tunes come from suspicious origins and can’t be trusted. We’ve seen deleted trucks burn up turbos, run poorly with low boost, get worse fuel economy, and have endless error codes. Secondly, the DOT are getting better and better every day at spotting deleted trucks. Ever since the VW “Dieselgate” scandal, the EPA has been much more vigilant. They’re also cracking down much more often than they used to. This could lead to massive fines for you and they will probably go after your mechanic as well. Many of our competitors have been caught violating the Clean Air Act with their deletes. So it’s only a matter of time until deleting your truck won’t be an option. Lastly, these new emissions systems are a hundred times better than when they first came onto the market. When maintained, they work well and have very little cost to the owner-operator. Max Mileage FBC combined with regular cleaning every 250,000 miles  is the best way to keep these systems working right. Some of you may say it’s expensive, but if it saves you just one trip to the shop in a year, then it’s paying for itself.

Written by;

Bruce Mallinson & Andrew Wilson

Pittsburgh Power Inc.

3600 S. Noah Dr.  Saxonburg, Pa. 16056