Originally Posted by layback40

That is one tough lift pump you have !!! Sick ones would not pull the skin off custard.
I guess though that the low pressure was all the way around the fuel system so it was your IP high pressure elements doing the work.

I have seen fuel tanks expanded a little with air pressure to increase their capacity. You are lucky it didnt go bang !!
As a kid we once piped up 150 # to a 50 gal drum for fun. We ended up with 3 sheets of flat steel & a hole in the shed wall. Lucky we were not hurt. Our ears were ringing for a few days & our backsides were sore after dad found out what we had done !!!