Compression Ignition Addict
Join Date: Feb 2013
Location: Moses lake, wa
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What year is your truck? I found that you can not swap a pump from a 96 - 97 into a 94.5 - early 95 motor, as the later pumps do not have a check valve to keep oil in the reservoir, as the front cover has that incorporated, and if you swapped a front cover from a early motor onto your late motor you do not have any anti drainback system in place.
So it sounds like you need to check your numbers, serial number #201681 and below have anti drainback systems in the pump, while later have it in the cover. And no problem
Axel --> 16yo
96 CCLB srw. built E4OD, Diy E-fuel, Autometer gauges
4:10 lsd, Toyo M55 on stock steelies
Future plans include diy Traction bars, and zf5 swap.