The Holley pickups come two two a kit. You can buy more pickups if you want. Put one pickup on each side of the tank, or in all four corners. Each pickup has a filter screen material over them, and each pickup has a one way check valve, that shuts the flow off if it does not have fuel. Fuel will be flow from the pickup that does have fuel, not air. I'm not sure if this answers your question, I would hope it would. If you are not sure what a check valve is do a google search. Also, there are many threads here with information on the Holley pickups.
Those are the same as the Holley pickups. I ordered through Summit using the Holley number and those are exactly what I got (1 pickup per kit through Summit). I just fished one out if the fuel cell, and it even says Walbro on it.
I've used these in my fuel cell for a couple years. They work great for what they are intended for. I can park on a side hill with a low tank and watch the return stream through the cap opening. No bubbles at all, even with one pickup totally dry.
I would not try to use these for oil. The screen on the bottom is very fine and you would get no flow.
I wish I had found the pickups for this price. That's a great price.
I run them too, work great. But, this one time at band camp....my fuel was low (one p/u in the air) and I shut the truck off, then it wouldn't start till the p/u is covered in fuel again. I'm assuming the check valve opened once there was no suction from the fuel pump and it didn't seem to close off when the pump started again. This has only happened once so maybe just a freak occurrence. I have had my truck laying on it's side and it was still running (till I had no oil pressure) so they do work.
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