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Steve, my putting the FPR in the supply line was just a test of the pump/filter; the permanent installation is in the return line. But I was getting 0 there - so I was trying to figure out why I get no pressure in the return line but have pressure to the rails. Premise - I was not getting enough pressure to overcome the stock FPR. So I put the FPR w/ gauge in the supply just to test that - and got 39#. The pump should put out more than that so to test the filter I bypassed it w/ a line from the pump to the FPR/gauge. Still got 39# so: 1. the filter is not restricting flow; and 2. the pump is deficient. I ordered a new Walbro pump that will be here today. Of course, even w/ 39# the engine should fire up.
Jim, I know we went through this once before and my understanding is that if you want more pressure you do not have to mess w/ the stock FPR. Like Steve explained, the new FPR downstream of the stock FPR will dam up the fuel that the latter lets by; thus, increasing pressure upstream. But if you want less than stock pressure, yes, you have to disable the stock FPR. [We don't have to get into this here but I have gone on record saying that I have a somewhat difficult time finding where it says in the ITCS that you can modify the fuel rail. The rule allowing after-market FPRs should be clarified to expressly state that stock FPRs may be removed or modified if and as is necessary.]
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Let us know how it goes after you get the new pump. And thanks for helping feed my family with the Walbro pump purchase. :happy204: My company makes the motor housings inside those pumps.