More than a little confusion. They both say EFI, which didn't exist on either the GL1500 or ST1100 & pressure specs are not listed at all. Flow doesn't matter as long as it is enough, the carbs regulate the flow, pressure is what's most important.I've seen that pump on Amazon and wondered if it would work well. A minor bit of confusion exists on the Amazon listing though, it looks like HFP-360-ST is for the ST1100 with EFI, however, the HFP-360-ST-1 is for the GL1500. The title is the same for both, but the spec's table shows the different number. Apparently the two pumps have different weights and, or components.