There is a check valve at the inlet on the Davco. You could have trash in it, or it could be bad. I have had the same problem with a Detroit and a Davco. It ended up being a piece of aluminum sucked up from the tank holding the check valve at the Davco open and letting the fuel drain back into the tank after sitting a while.
C15 Cat wont start
Discussion in 'Trucks [ Eighteen Wheelers ]' started by silver dollar, Nov 7, 2012.
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Another question for you and the other members here; If i have to open a fuel line between the tank and the Davao will the transfer pump draw fuel or loose its prime? How would I removed the air? -
No it should recover quickly unless its the check valve that is draining the fuel from the head
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close off your right fuel tank make sure your fuel cap is tight on left tank. Then pull your vent hose out of holder on tank. Take an air blower and add air to vent hose not alot of air but enough to create about 2-3 psi in tank. If you have leaking hose on suction side it will show just be carefull dont remove cap with pressure in tank. It will slowly leak out of tank because fuel cap will leak. If you don't close the right tank it will push all the fuel from left into right tank. This will find a leak if indeed you have one.
silver dollar Thanks this. -
Be very CAREFUL if you pressurize the tank with air. They will not take much pressure before they will pop a weld joint.
The first thing I would do is change the check valve in the secondary filter baseVampire, heavyhaulerss and silver dollar Thank this. -
Is this one of the Internationals that had a problem with the baffles in the fuel tank breaking loose with a little age, you will hear it banging around in the tank if you stop abruptly. I can't remember the year I saw several that came loose. The reason I ask, I had a friend that had this problem on a Pete, he was at his wits end trying to find it, when he finally pulled the suck tubes from the tanks, and one of the tubes had a crack in it at the top. If you bought this truck new, then you would know if one was ever loose. If you bought it used, and you haven't heard a baffle banging around in the tank, then check the weld where the tank end cap is welded to the tank tube, check each end of each tank, if it looks like the factory weld on both ends of both tanks and you don't hear a loose baffle, then the suck tubes are probably okay, if one of the tanks has a different looking weld on one of the end caps, I would pull that suck tube and check it, the baffle banging around in there very long could bang the tube back and forth a couple of times and crack it.
Another thing I found once myself was a crack in the filter housing on the surface where the filter gasket meets, factory defect? I have no explanation for that one. Another time I found a crack on the filter housing where someone over tightened a fitting in the filter housing so that it would point in a certain direction, but one round to many and cracked the housing.
One last thing, I have pressure checked the suction lines also trying to find a leak, but it doesn't always show up when you do that, because the hoses are made in layers, and it is possible to have a crack in one of the inner layers, but the rubber will still move somewhat, acting like a check valve, pump it up, no leak, put a vacuum on it and it will leak. Seeing the age of the truck, my opinion is that the hoses are due to be replaced, so take that for what it is worth, opinion only. Let us know what you find out if you would, it will help someone else down the line.magoo68 and silver dollar Thank this. -
I want to give an update on my problem. It was the check valve. Yesterday when I went to the Cat house to get "parts"
There was a tech guy at the parts counter who said he had just repaired a truck with the same problem as mine.
As a matter of fact, my truck and the one he was working on was once part of the same fleet. Anyway, he pretty much verified what everyone here had said; check valve was stuck in the full open position. I went out this morning and it fired right up without hesitation.
I want to say thank you to all of you here for your help. I have learned a lot from you all, and I really appreciate it.Vampire, Taildragon and Licensed to kill Thank this. -
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