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Drain/plug on VE pump?

493 Views 9 Replies 4 Participants Last post by  Blackduck59, 
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Trying to figure out if I’m missing a plug on the bottom of my Bosch VE pump on my pickup. There’s a threaded hole that looks like it possibly should have a plug or something? Threads look clean… trying to figure out if that’s where I have a leak coming from up front.
The hole is slightly back from the timing device and a little closer to the block. After looking at a diagram possibly this isn’t part of the pump even?
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9297oldram
In that area is the AFC vent that will leak fuel when the slide pin "O" ring gets bad, fuel will run down the back side. Also the distribution head "O" ring can leak.

The vent is the black round thing with a tube coming off of it, the line showing the starwheel location is going through it.

mopar1973man.com

Tuning Up A VE Injection Pump

Here is a brief write up on how to turn up the power on your 1st Generation Cummins truck with a Bosch VE Injection pump. Low Boost Fueling Adjustment (Smoke Screw) Beneath the cap is a Torx T-25 screw and a lock nut that holds it. The locknut is 13 mm and has a 'break-away torque' of around 100 ...
mopar1973man.com
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9297oldram
First gen boy said:
So is there any use for that threaded hole that’s circled? is it supposed to have something down the line of a drain plug or anything? Or are u saying that nothing would leak from there and it’s an o ring somewhere leaking
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Don't know what it's for but nothing will leak from there, start looking elsewhere for the leak.
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9297oldram
thrashingcows said:
That is a blind thread and doesn't have a cap or run into the pump. I'm going to guess that the block off plate on the back side of the IP...directly across from your KSB on the front...is leaking. The two bolts tend to loosen over time and then the fuel can slip past the O-ring. You can try and tighten them up but usually there is not enough room to get a wrench on them back there...even if you do the chance are the O-ring is toast and there is no way to change that without removing the IP.
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I forgot about that plate on the back.
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9297oldram
First gen boy said:
View attachment 970942
this is what you’re talking about correct?
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No it's on the back side of the IP where you can't see.
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