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GlennLever's avatar
GlennLever
Explorer
May 30, 2015

Fuel Leak / Injector Pump / Bosch Governor / Cover Plate

Ok, I have had a small drip for awhile now.

I thought it was from a hose and have had Cummins look at it several times now.

Today I decided to look at it myself.

This is the mark it leaves after sitting for two days.



I crawled under the unit and the hoses did look dry, and with a flash light shining straight up I found a drip. It is not clear in this photo, but it gives you the location. Starter is to the right (front of the motor home (DP))



So we zoom in a little bit and you can see the drip. When I was under the unit I did not know what the part was, but it turns out it is the bottom of the governor housing.



I went topside and opened the engine compartment and it appears the fuel is leaking from this cover plate.

At first I was concerned with the fact that the bolts holding the plate in place might indicate a heavy spring being held in place by the cover. I now believe it was a warranty safe guard to keep people from playing with the governor settings.



It is quite wet below the plate and not so wet above it. I believe that wind has been blowing the fuel up.

I wiped the part plate clean and find.





I have found it extremely hard to find reference material on the net about Cummins, but I did fine a video on the disassembly of the pump.

Bosch Inline Pump Disassembly Part 1 of 2

I watched the video, there is VERY little conversation or expiation of what is going on but I did capture a screen shot of the cover removed.



My hope is the o-ring has been compressed over time and is leaking. A friend of mine has suggested that the O-rings in the injector pump have been destroyed by the low suffer fuel and I have fuel bypassing the pump into the governor under pressure and that is why I have a leak.

I do use fuel pump lubricant in my fuel.

Has anyone had any experience with this?

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