B737 First Officer reported ground personnel said right engine gushing fluid was confusing to flight deck as to which engine; resulted in both engines being shut down.

Narrative

Pushed back and started number 2 then number 1 engine. As push crew was disconnecting they reported the right engine was gushing fluid. The Captain thought they meant aircraft right so we shut down the number two engine. But I informed him I thought they meant ground crew right as they looked as if they were still watching the leak. In the mean time they had disconnected so we waived them back and they connected and confirmed the leak was still gushing from number 1 engine so we shut down the number one engine. We looked for an engine fuel leak in the QRH (quick reference handbook) but did not find anything in the fuel leak section. Since we had no annunciation I checked un-annunciated QRH and didn't find anything. At this point both engines had been shut down and we had requested the fire trucks to ensure any potential for a fuel fire could be secured. We requested maintenance to come inspect the leak. After some time. Maintenance came out and confirmed the leak had stopped at that point. Maintenance said they believed the leak would stop after an engine run. So we towed back to the gate and they ran the engines. After digging a little deeper. We found the engine start fluid leak QRH.