Massive oil leak five minutes after starting

1986 MAZDA B2000
160 MILES
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DEREKFORREAL
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After installing a head gasket, (all went very well). I started motor, ran it for ten minutes, stepped to front of truck when idle was good, and there was a 4’x4’ puddle of motor oil under the truck.
Because I poured a whole quart of oil on my cam and followers after installing the head, I automatically figured I had blown a rear main seal. Pulled transmission and replaced pressure plate/throw-out etc., while I was going to be down there anyways and all went well again.
Started truck five minutes into it starting again, same as before. A 2’x2’ puddle of oil all over my poor driveway. I took a closer look at where leak was coming from, and it seems to be above the starter/oil filter area. Is this an oil sending unit maybe? (Oil filter screws directly into side of block)
Feb 7, 2018 at 2:42 PM
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STEVE W.
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Sending unit is most likely. Unless it has the factory oil cooler, the gasket on those can fail and dump oil quick. Should not be hard to find a leak that bad though. I am guessing you verified it is not the valve cover gasket already?
Feb 8, 2018 at 6:13 PM
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DEREKFORREAL
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Yes I have sir. Thank you for your reply. Problem is similar to another persons on here so when I do find out I will post fix.
Feb 9, 2018 at 10:01 AM
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STEVE W.
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There is an outside shot it could be a fuel pump to head gasket, as I recall that engine has a cam driven mechanical pump. Give it a bath with a brush and Dawn laced water, then dust it with some baby powder or foot spray, start it and look for the oil streaks.
Feb 9, 2018 at 11:34 AM