So I’ve seen a lot of discussion around the carrier/facet lift pumps lately. I thought I’d share my experience. I plumbed in a fuel pressure gauge not long ago and finally got a chance to work the truck today. My pump is the 9-11 psi flavor (PN4022 I think). It’s on the pass fenderwell. Fuel pressure is measured off the filter restriction port on the filter head. Here is a shot pulling about the longest grade on I-68 in western MD. 4th gear. 65-68 mph ish. Flat on the floor. Bull Moose IP. (Yes I was pretty happy with that especially given the stupidly huge headwind. Like driving with one foot on the brake!) So at idle I see 8+ psi. Here you can see it’s down just below 4. Should still be adequate fuel delivery. Now for the caveat. I had planned to write this post saying the pump sucks and I need more fuel. Coming into Cumberland MD I was pulling it almost to 0 psi. Then I switched tanks to the front tank and it barely ever dipped below 4 psi. So there is something with more restriction in the rear tank circuit. The other things that make my install different are the custom fuel lines -all bent aluminum thin wall tube for large ID. 3/8 OD feed and return. I ported the 1/8” npt fittings to larger than standard bore (1/4 or 5/16” ID don’t remember for sure but I think it was 1/4”). So what does all this mean? It means if you are having starvation issues with the facet pump, it may not be the pump’s fault. The stock fuel plumbing is more restrictive than my setup I would guess. In the end, I would still say it’s barely adequate but it will supply pretty much up to 9/10 th’s of what my truck can possibly use with my IP/turbo setup. For everyday driving, starvation should not be an issue especially on a stock-ish setup. In other news I may be sending my Stewart Warner sender back again as it is leaking. Just need to figure out from where.