Used to own one but a petrol variant , look I'm stunned by the response you're getting everyone is usually very helpful , it's not as if you're a new member and didn't do an intro so I really don't know .
Sometimes if there's no one around that knows the others might not want to say anything in case it's wrong and with your problem it has a lot of it could be this or it could be that .
Yes it was playing up a bit before but you had a likely culprit if you had a leak in that line , just a matter of problem solving by going back to the start of the system and working forward .
Hope you kept the area clean so you didn't get any crud into the injector by the way , one last thing is on some injector pumps just below the banjo bolt for the fuel inlet there is a thimble like mesh strainer which can become blocked , most pull them out and throw them away but the experts say they should be there as a last line of defence to stop dirt getting in your injectors .
We only hate Toyotas really a maverick is just a rebadged Nissan .