Turbo 570 Super fuel in oil

Another fuel in oil question but first I'll give a little background and update on my tractor.
I posted here a few times last year about adding more power and thinking about going with a turbo.I was very successful in adding a turbo to the otherwise stock 570 Super diesel pulling tractor last year.It's a small turbo capable of 12 lbs of boost although I have a wastegate set to limit the boost to 5 lbs.
After much discussion with Keystone Turbo I choose this one because it would just fit under my hood,I wanted just a little boost to gain about 20 hp with lots of grunt at the governed stock rpm's. Most of all I wanted Didn't want to hurt my engine.
I turned up the stock Bosch PSB6A fuel pump pressure to max and retarded the timing 4 degrees to ease peak cylinder pressure a bit since I wasn't going crazy with the rpm's.
On the dyno while adjusting the boost, I was showing gains of at least 20 hp with ease at part throttle but boost was going up around 10 lbs without even bringing the tractor to it's knees so I would abort the test and back the boost down.
After several part throttle pulls,I finally got the boost to peak at 5 lbs at full throttle and a hard pull but the weak PTO would give up before I could really bring the engine down below 540 rpm.At about 100 hp the PTO speed would drop but the engine wouldn't.Even at this modest setting I've got a min of 25 hp over where I was,but I feel there's at least another 10 left that the PTO wouldn't handle.
The results on the track show this to be true.Boost gauge stays at 5 lbs,exhaust temp gauge stays below 1200 even in the hardest 300+ ft pulls so everything is great right? I was happy until I found I was getting fuel in the crankcase.
Before installing the Turbo in my quest for power,a fellow 570 puller said he'd installed an electric diesel transfer pump to help push fuel through the filters to his injection transfer pump.Made since at the time so I added one too but saw no gains on the dyno.I figured it couldn't hurt so I just left it on.My pump had been rebuilt about 15 years and 200 hrs ago so I guess it was up to the task already.
When installing the turbo I removed the oil pan to correct a badly leaking gasket and to ease installing an oil return fitting from the turbo.All went well except after only a few pulls my oil level was up by at least a quart.I removed the electric fuel pump,changed the oil,and hoped for the best.Tractor still ran great but
after just one pull,maybe 2 hrs running/idling,it has again gained about a quart of fuel in the crankcase.I won't run it anymore until I can get the problem fixed.
Now,finally the questions.
Is it likely that I damaged the diaphragm/seals of the transfer pump on the injection pump by adding the extra pressure of the electric pump(I think it produced 10-15 lbs)?
Would turning the injection pump pressure screw to max have any affect on seals in the pump?
I realize the pump needs to be removed to repair a shaft seal failure if that's the problem but could a transfer pump be fixed first without pump removal hoping it's the culprit?
I loosened the injectors one at a time while running and they all made a significant difference as they should.
The engine was overhauled a couple hundred hrs ago and has very little blow by,barely detectable.
To add one more variable,the oil leak I used to have was bad enough to mask a oil gaining problem so this condition may have been going on longer then I realized,although I did have to add oil on occassion
Sorry for the long post but I always intended to give an update after my turbo install for all interested,so I thought it fit well with this problem.
Thanks in advance for any enlightenment and I'd be happy to share my turbo installing process with anyone interested.
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I'd start with the PK 7910 supply pump seal first since it's the easiest. If the original supply pump is working as it should the electric pump isn't needed. The seal can get hard and brittle though. Next would be all the hydraulic head seals and control unit O ring, they can leak into the crankcase also.
 

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