[QUOTE=barry12345;3567569]Depending on the output pressure of the lift pump. You might want to install the old pressure relief valve for testing. I do not know what pressure the replacement ones are calibrated at. Yet obviously higher than the originals.

If you see output from that valve it is okay to leave it in for the testing. What I was thinking was if there is air involved it cannot partially clear through a constantly closed relief or overflow valve. All of the air instead would have to get processed through the injector lines. Just a thought though.

Another indication was did you observe any difference at all with the new relief valve? If none the fuel pressure supplied could have been too low to open either of them. Or perhaps is not enough to open the enhanced one. It s pretty obvious you probably have some form of fuel starvation with the times posted. You might need a fuel pressure gauge to get a clear picture of what is going on or to reduce possibilities.

Also keep in mind that too much blow by pressure can partially or totally shut down the injection pump. I have no ideal if you can run these engines at speed with the oil filler cap off as a test. I would make sure at least my crank vent hose was not badly gunked up internally.
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There was improvement when I installed the uprated spring. Also, I don't think that I have the old one anymore either, so putting the old one back in is a null point. I do not think that I have any air in the IP that hasn't worked out.
With the amount of oil that gets blown out, I would have to get creative if if tested without the oil cap. I'll look into that more tomorrow.

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'85 300D ~ 381k, HD Bilstien shocks, 27.50x8.50x14R General Grabber AT2 tires, 4 E-Code headlight upgrade with 90/130w bulbs, boost turned up, new timing chain, and injectors. SOLD

'85 CJ7 ~ OM617 swap, Tarus electric fan, T5 trans, Dana 300, 4.88 R&P, Mile Marker locking hubs, ALDA removed, AMC 20 rear disk brake conversion, Aussie locked with 33's and 5" Rough Country lift.