Losing RPM

[donotfear]

UPDATE:
Well, he came out (former BF). Diesel mechanic, 40 years. He checked it all out. Opened fuel line, fuel was getting through. Air filter was a mess....very dirty. Replaced air filter today. Filled up with diesel. Ran for 5 min., then started working. Bush-hogged about 10 minutes, no problem. Then started losing RPM again. Was in higher setting, 1st. When I stop, put in neutral, it seems to rev up again. It lost RPM for a total of 5 times, but never idled and died, always revved up again.
So, he said the fuel filter looked clean. I turned it on so he could test to see if fuel was getting through the line. It was. I'm asking him now what the next suggestion is.
I showed him everything you guys have suggested, also.

Crazy Tractor Lady with no experience. :confused2:

Okay, I was told to loosen the fuel cap and try that. He seems to think that could be a possibility. I
have asked him 3 times to refer me to someone else, but NOT. He said if the tank is not venting and forming a vacuum in side the fuel tank, it could cause this. He said it sounds like it's running out of fuel. He said to look on these forums to see where to check the fuel pressure and how much pressure it should have.

In other words, he doesn't want to waste his time helping with it.. Whatever.

 

[DwayneB]

Okay, I was told to loosen the fuel cap and try that. He seems to think that could be a possibility. I
have asked him 3 times to refer me to someone else, but NOT. He said if the tank is not venting and forming a vacuum in side the fuel tank, it could cause this. He said it sounds like it's running out of fuel. He said to look on these forums to see where to check the fuel pressure and how much pressure it should have.

In other words, he doesn't want to waste his time helping with it.. Whatever.

Don't get discouraged. You're making progress. He's probably right it's starving for fuel and he probably doesn't want to mess with it for free. Offer to pay him a little to keep trying. He probably knows how to check the strainer coming out of the tank and the fuel pump pressure and flow.
I like helping people for free but, I have my own obligations. Sometimes I get sucked into something that ends up taking more of my time than I wanted to devote to it. I usually stick with it and never take any money but, everyone is not like me.

 

[donotfear]

I have offered payment but it's kinda hard when that person was someone in a previous personal relationship with you who no longer wants it. He wanted some fencing panels, but now says he does not. I assume, by the short answers I get, he is not interested in assisting. So I'm going another route.....hopefully.

 

[sixdogs]

Don't get discouraged and we've all been through it. These things are frustrating but you'll get it fixed.
You're gaining experience by the hour...

 

[lennyzx11]

That is a valid check for the vacuum forming in the tank.

Try running it until the problem appears, reach up and loosen the fuel cap. See if the problem goes away.
You'll have to loosen it enough for air to get in.

Are you sure he checked the actual fuel filter and not a simple water separator? I don't have a mahindra. But some tractors have a simple filter to separate the water that the operator should drain daily(or when water is seen) and then a cartridge filter located in a canister.

On the fuel pump test. Though pressure is a factor, the injector pump makes the high pressure. That electric fuel pump pushes(or pulls) the fuel from the tank to the injector pump at a lower pressure. A fuel Volume test would be more beneficial in telling you if it's delivering enough fuel.

One sign of an electric pump going out is low volume, and it seems to work at idle or low Rpms or cold but revved up or warmed up, runs out of gas.

Don't let it frustrate you. There is plenty of talent here to help you (and Zach) figure out the basic problems. If not, then load it up and take it to a shop and have them diagnose it for you for a hourly rate.

 

[donotfear]

Lenny, thank you very much. I was pretty frustrated last night but I'll tackle this thing. I put a message out asking for assistance.

 

[ericm979]

Usually when the fuel tank vent is clogged it takes a while of running to build up enough of a vacuum to affect the engine operation. If you have a gravity feed system it'll happen more readily than if you have a lift pump. Gravity fed systems have to have the fuel tank above the fuel injection pump on the side of the engine, systems with lift pumps can have the tank lower down. With either system measuring flow for X period of time will tell you if it's flowing enough. If your shop manual is good it'll have that info.

I'd replace the fuel filter just in case. It can be clogged enough to affect running even though it "looks" clean.

 

[donotfear]

UPDATE:

I loosened the gas cap, it does the same thing. Loses RPM after 10-15 minutes. I honestly think that the first person who did maintenance for me did not do everything. He changed some filters and the oil, but I guess something is amiss. I will be changing the fuel filter.(s)

I'm going to make a good faith effort to study the manual and Youtube it for how to replace the fuel filter. I'll call for help if I need it, which I probably will. My issue is usually strength to unscrew things because I lost a lot of muscle. I'm letting it sit, for now.

I'll update again. I appreciate everyone giving information in a kind way. A lot of folks don't have patience for a beginner and believe me, my college education "ain't" helping.

Crazy Tractor Lady

 

[sixdogs]

Years ago I had a similar situation that is worth mention. I had a tractor that had a fuel shut off lever that you turned before the filter was changed. Anyway , the tech that did the service over turned the lever when he closed it and it partially restricted the fuel flow after it had been running for a while. Took a while to figure it out. Just a thought.

 

[stevem5215]

It should also be asked... where are you located in case someone on here is close by and willing to stop over to check it out.

The fuel filter is a an easy way to go on this. You could've gotten some dirt in there when you fueled it last that the strainer didn't get due to it being in the tank along with all the dirt from the strainer. I know on Jinma's they have a strainer at the top of the fuel bowl and it will clog up with junk. The easiest way I found to clear it quickly is to just take off the glass fuel water seperator and blow air from a compressor up into the bottom of the tank. That cleans it out temporarily at least. Also, I was having trouble with my Ford 1900 losing power and shining a flashlight into the tank I found a bunch of yellow jackets at the entrance to the petcock area blocking the fuel flow. How they got into the tank is a mystery but I'm guessing they were hanging around the fuel can too much and got drunk lol

Steve