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Hi guys, new member. I have 1986 f250 4x4. Just installed 1969 460 with 73 heads. New Edelbrock carb. Truck runs well and have put a couple of hundred miles on it. I had it sit for 12 days. (checked oil after 10 days and all good)When I went to start it it acted like battery was dead. When I went under the hood noticed a puddle of what looked and smelled like gassy oil. Checked oil and it was up to top of dipstick. Puddled gas on valleys of intake. Drained oil to find abbout a gallon of fuel in the crankcase. Pulled plugs, disabled coil and hand cranked to empty cylinilders of gas. No wonder it wouldn't crank. Hydraulic lock. Checked carbfloats and they shut off when lifted manually. So where did fuel come from? I have had 2 ideas presented to me. With tanks 1/2 full vapors have built up and pushed fuel up through carb and forced past needle and seat. (Edelbrock states 6 1/2 pounds max fuel pressure). Truck has no emmissions gear (vapor canister line plugged) Other thought is that involuntary power to fuel pump (22 year old ignition switch). I have put in fuel regulator. Any ideas? Sorry about long post. Need to find root cause. Replace ignition switch. Put switch on fuel pump relay to disable when truck sits? Thanks.