I can't see why it won't work dude.
You'll just need to make sure the second pump has a good one-way valve so it doesn't just vent the line pressure.
044's have an external check-valve, wereas it's internal in a lot of other pumps. You'll just need to test the check function of any second pump and add a check-valve if required.
Will you be using an ECU output to switch the second pump? (sounds like a good idea actually)
Bookmarks