the throttle will decrease, and at times it will even stall. I have 1/4 tank of gas. the fuel filter seems ok. any idea? runs all day on the flat. runs fine. but if i hit a bit of an incline, then the RPM go down and it can even stall.
No use going over it all again, it's been done to death many times already. Please post a Serial number for accurate information. See this THREAD which pretty well covers it. Possible causes:- Water/sediment in fuel tank. Plugged fuel feed line. Plugged inline fuel screen. Plugged passages in fuel filter head. Let us know how you get on.
SN vgtl06038. as i go and blow out the lines, do you think ill have issues getting fuel back to the cylinders? i have an older cat 416b backhoe, and every time i mess with fuel or it runs out.. omg..takes me forever to get the air out of the lines. i am kinda hoping that this 276D has some type of auto pressure system and will figure out the air if i take stuff apart. ty so much for your answers. ill start on the top of your list, and also what the guy in the other thread did - blow out the lines.
Draining the rubbish from the fuel tank would be a good starting point. Find where the drain plug is (there are two possible locations) and park the machine overnight. Then drain it first thing next morning. If you do find water/sediment in the tank then you know conclusively what your problem is, you only then have to address all the other components that could be plugged up as a result.
You can run the electric fuel transfer pump to purge air from the system (back to tank via the pressure relief valve) without having to start the engine using the following procedure. NOTE: You should use this procedure every time you change the fuel filter element. Turn the engine start switch from the OFF to the ON position. Do not start the engine. This operation starts the fuel pump which will run for approximately 30 seconds and then shut off. If the water separator bowl under the fuel filter is not completely full of fuel after this, cycle the key switch back to OFF, wait a few seconds, then cycle it back to ON again.
perfect. that sounds a lot better than what ive had to do on older engines... 'cracking' the fuel line and letting it leak..
Don't do that on a common rail engine. Definitely not advisable.
developments: new filter v old filter
turned key on and off for 30 seconds (i think a pump was running).. did it like 8-10 times and went from the little bit in filter to 5/8 full
BUT, then when i ran the unit. the little 'other' filter in the back seemed to empty out, and the larger one with the fuel filter just went lower and lower.
so, i quit for the night. wondering if any of this seems to form some type of logic to other here in the forum who know a lot more than i do. I 'blew' out one line, but didnt do them all because its gonna be rough to unhook some of them. everythign in there is so tight.
Really that pump should have filled the filter in about 2 cycles of the key switch. I think you have something blocked somewhere, fuel feed line maybe.? If not it's probably the passages in the head of the fuel filter assembly. Try draining the water/sediment from the tank (don't drain it completely, it's not necessary) as a first step and see what comes out.
ill get on it.
drained the fuel tank, captured it. seemd pretty clean. nothing much other than fuel. so i took off the fuel pump and that strainer - ordered new pump and strainer. other thoughts?
I would have done all the stuff below first but it's not my money......... 1. With compressed air blow the fuel feed line from the pump in the reverse direction back to the tank to ensure the suction line is not plugged with anything it may have sucked up from the tank. 2. Remove the complete fuel filter assembly from the machine, separate the filter element/bowl from the head, then remove all the fuel line connections (circled) in the head. Then blow air through the passages or run a length of wire through them to make sure they are clear of any debris that will reduce the fuel flow through the head.
i got the fuel pump becasue the one that was on there was a replacement, and the reviews across all sites seem'd rough. so as i was working on it, figure i wont be pulling that stuff apart next month. with luck. will blow out as you indicated. have it all apart now so good time to check it all.
took the pump off. hoze 9 comes into the top of the unit, but on the undeside it is just what seems blocked, or a super tiny hole. i i did try some compressed air, but i dont think it functions. or that small hole is some type of pressure regulator part
and from your PDF, the red circle showing what i thought were 2 ports, they are totally blocked, i wonder if they were cast blocked?
Those filter heads commonly have castings for other ports that are cast over. Probably minimizes the amount of different castings needed in manufacture.
See my post above. You’re supposed to remove all the fuel line connections from the head before attempting to clear the passages in the head itself. You should also try blowing through the connectors separately to make sure that they are not clogged. Take a close look at the fitting on the top of the head. IIRC it is in two parts, the elbow on top and a straight fitting underneath. Again - completely disassemble and make sure it’s not restricted in any way.
Update. #2 is just an elbow, #3 is a check valve make sure it’s working correctly.
copy. so the casting is as should be, just nothing was ever machined thru those ports.
so how will i know this works? i cant really do much with air on the part - or the pressure is very high against the valve.
Have you removed all the fittings from the head.? Try simply putting your lips around the check valve and blowing through it. There should be little or no resistance in one direction of flow and absolutely no flow in the other direction. That's why it's called a check valve.
solved: cleaning all the fittings, blowing out all of the hoses. checking the check valve. draining the tank. in the end the replacement of the fuel pump back to cat brand gave good flow thru the system. runs good now. thank you for all of the help.
It's an unfortunate fact of life that most users of this type of machine do not pay nearly enough attention to controlling contamination during refuelling. That's why it's common to find contamination in the tank and everywhere else right through the fuel system. Eventually it could reach the really expensive fuel injection system components which leaves an owner facing a major expense for repair.
thanks again for all the help. getting machines up and operational is always a great feeling - hauling them to the shop feels like a failure somehow