wacopaving

Hey guys, Now that the electrical problem is fixed I have another issue. I have an EM7 engine in this truck and for some reason it’s losing its prime. Replaced the check valve in the side of the block. Checked all of the injectors by taking the injector lines loose and seeing if the cylinder die out properly. Checked all fuel lines and filters, which are all clear of debris and trash. The only thing left that I think it can be is the primer pump. It’s a super hard start in the morning but usually the rest of the day is okay. If you let the truck sit too long it loses its prime and then you have to prime the shit out of it and crank it over a bunch to get it going. Any ideas of what it could be?

Hey Terry, I will check that in the morning but I’ve run through every relay and wire in that dash. Doesn’t seem to be anything in there. I replaced the starter solenoid on the fire wall. It’s weird because when I bypass the solenoid it cranks right over. Otherwise it won’t even turn over but 2 revolutions with the key. It just wants to click. It just seems like there’s a bad ground or short somewhere.

I have a 1999 Mack RD690S. On and off we have been having issues of the truck not starting some days. One day it is fine and the next it’s not. You turn the key on and you hear clicking like it’s trying to pop a fuse. A lot of the time it doesn’t even cycle through like it’s supposed to. Anyway, when you turn the ignition to “start” the truck, the dash lights flicker on and off, the tachometer spins a quarter turn and it just clicks and clicks. You may get a revolution or 2 but then it dies out and you have to shut the key off before trying again. All of the fuses and wiring under the dash has been checked. It all checks out fine. Getting around 12.9 volts on the batteries when checked. I checked all of the connections to the starter, solenoid, alternator, etc. it’s all tight and secured. I can’t seem to find the problem. We were working on it the other day and out of the blue it was fine again. Turned over and started up no problem. I keep tracing wires to find maybe something exposed and shorting out but I haven’t found anything yet. It’s really frustrating me because I know it’s something simple. Any help is appreciated as I continue to workout what the problem is.