I have a 7500 that’s sucking air. I believe it’s between filter head and pump. Mainly because it stumbles at startup. @reeferwrencher are there any common places for these to suck air and do the primer pumps give trouble on this unit?
2016 carrier 7500
Discussion in 'Refrigerated Trucking Forum' started by 062, Feb 26, 2020.
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062 Thanks this.
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It happens on all models tighten all the brass fuel fitting you could pull the pick up line out of the tank as well and make sure its cut on an angle and isn't forced against bottom of tank seen that many times but pressurize tank and look for any small leaks for sure
062 Thanks this. -
Buy a spare fuel tank cap. Drill a hole in the center-7/16" bit if I remember-and buy a 1/4" NPT tap from a hardware store, and tap away. The size of the drill bit to use will be on the package of the pipe thread tap. Screw in an air line quick connect with and pressure away with a cheap air pressure regulator from Harbor Freight set at 40 lbs. You might see fuel at leaking at the ends of the supply and return lines. If not visible, I would just tighten down on all of the ferrels around all of the line's ends. If it still loses a little prime sometimes-particularly in cold temps-cut the ends of the fuel lines back some and put new ferrels on at the same time. The cap and the pressure regulator (for pressurizing while out on the road with air from your truck that is governed at approx 120 lbs) is good to keep in the truck. Then you don't have to hassle with the little primer pump.
062 Thanks this. -
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Keep in mind, a leak anywhere in the fuel delivery system (including return line) can cause it to lose prime. I learned this the hard way as my trucks engine kept increasingly losing prime, and I eventually figured out there was a small crack in the return line coming from the head, going to the fuel tanks. It wasn't until I put pressure to the fuel system with the truck engine off that I saw fuel spraying from that line. I would simply just change lines, starting with the one between the filter housing and the pump, one at a time and see if the problem goes away.
062 Thanks this. -
@reeferwrencher
Why Thermo King Whisper Units are priced lower? What kind of problems these get along the way? -
KB3MMX and Blackhorse77 Thank this.
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Thanks to a little trouble from the unit, I found out the cause. There’s a recall on the injection pump. Mine wasn’t put into service until 2017 so it was still under warranty. Service manager said it would have been $1200+ otherwise.
KB3MMX Thanks this.
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