cat 3406b hard starting

hi , iv got a 1988 7fb 425 hp 3406b cat, this thing has always only needed a crack of the fuel petal and 1 revolution to fire up , in any weather hot or cold, if i cold started it it would light snd barly chug til it warmed up and sat steady at 700 rpm, until 3 days ago! i parked for the night went to start in morning and just rolled over, had petal to floor most of it wich i never had to do for the last 4 years! it finally started just as i was allmost out of battery power, next morning same thing but this time once it fired it idel at 800 rpm for about 4-5 minutes then dropped back down to its normal 700 or a bit less cause it was a cold morning, this morning same thing finally fired , almost out of battery power, idel higher than normal at 800 again then droped to 700 , acted like a electonic engine on high idel then dropping, anyway i know this is a long post but tryin give the jist of things! things i have checked, shut off solinoide is fully working removed n tested and checked wiring,transfer pump was replaced a year ago with a new oem cat part, and also the pump primer replaced with a oem cat part, i should mention when i try to start this thing i have tryed to pump primer and it is hard all 3 days wich tells me im not loosin prime correct?im thinking something in the govener is at fault , any ideas on what i czn test , try, replace?

 

i should also mention the truck runs as normal , pulls good and will restart normal once its bin started that day , if i sit it for 2 hrs no problem sit for the night thats when this problem occurs, thanks in advance

 

it hasnt bin real cold , first night it happened or shoukd say morning it was 40 degrees, next 2 morning bot 32-34,the primer pump is definitely hard after sitting all night but i will check those valves and report back,i do have a fuel pressure gage but finding the fittings to install it inline may take a bit! i am assuming to check lift pump pressure correct? 30-40 psi?and is it possible to post a pic so i can check that rack bar and notch? im just not quite sure where u mean to look , thanks

 

ok great, i have a gut feel it is something like that, no gelling wont be an issue, years ago i did have a problem with this b model gelling when got real cold, i installed an artic fox fuel heater in the frame and run coolent lines to it and also plumed it so my webasto would prewarm fuel as well as engine and it worked great never a problem gelling since