#5 and #6 cylinders full of gas

[venom97]

92 explorer sport 4.0 5psd. The thing was running fine a week ago and was sold to the person I picked it up from. He had it for 4 days. The story that I got was that he was daily driving it and it just died. He thought he ran it out of gas, tried it after a few minutes and it fired back up. He filled up the gas tank and drove it all day and on the way home it died again and wouldn't start back up. I charged the battery and it would not even crank. I did turn it over by hand and felt good except when it got to one spot it seemed like high compression. I pulled all the plugs and cranked it, #5 and number #6 cylinders were full of gas. So I was thinking injectors but the likely hood of two next to each going bad seems slim to me. I wouldn't think it was a regulator due to it only being two cylinders, so I'm thinking possibly a short in the harness after #5 injector on the harness. Am I overlooking anything, has anyone else already go through something like this that can add some tips?

 

[venom97]

Bad Fuel Pressure Regulator

 

[Roont]

I'd think either those two aren't igniting (sparking) the fuel so the fuel just sitting there, or the injectors are drooling between shots and too much to ignite on compression stroke?

What did they find?

 

[venom97]

I took the vacuum line that runs from the fuel pressure regulator to the intake and this is what I found. Put on the new regulator starts and runs like a champ.

 

[boominXplorer]

That'll do it. I've also seen an injector stick open and fill a neighboring cylinder but in this case you got it figured out!

 

[Roont]

She was thirsty glad you found it and on the road again!