Hey guys, I just put a new engine in a friends 2000 f450. My question is how long should I have to crank to get it to fire? The batteries were low so I could only get a few seconds at a time before the charger couldn't keep up. After about the tenth time of a 5 or 6 second spurt I finally got oil pressure. Then maybe 10 more times and started to see a little smoke out the tailpipe. But tried maybe 6 or 7 more times and nothing. I gave up for tonight and left the batteries on trickle charge for the night. And also checked the fuel bowl before I left, it was only half full. Does all of them is sound normal? Is there any tips to getting it all primed? .... Also I did an injector buzz test and all was good.The engine I put in is a 96, new heads and the 2000 injectors. Thanks for any help.