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Hi, along with Dave's and John's thoughts I puzzled about the 1988+ remark. The 85 would have LH2.2 as well as the 88. Not owning anything between 85 and 88 I pictured the fuel rails being unchanged through those years, only to change in 89, for LH2.4 introduction.
However, I am having a bit of difficulty imagining how a working fuel pressure regulator could stand to benefit from a blocked return port if the pump's delivery was inadequate. There would not be anything at the return port to block.
Was the motor from an 88 240? This might be a dangerous fix applied to overcome the typical failure in the air mass meter. Dangerous, because the working pressure in the feed and rail would rise to well over 100 lbs. An 85 or an 88 should have an air mass meter number ending in -007. One quick test I can imagine, is to try it with the return line unblocked, but with the AMM unplugged. If it starts and idles then, it is a sure bet your AMM should be replaced. If so, look in a salvage yard or on e-bay before opting for the parts houses.
If not the AMM, i.e., it still fails to start and idle with the AMM disconnected, have the rail pressure measured before throwing parts at it.
So I could be wrong on both counts.
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Art Benstein near Baltimore
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