Fuel Pump Primer Bulb.

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little_fellow

Well-known member
Joined
Oct 6, 2009
Messages
170
Raise the roll over cage, then there should be two metal plates screwed on top of the fuel tank. One for the fuel gage float/sender and the other one for the fuel line. Mine has four screws holding it on with a 90 degree fitting in the middle of the plate. Remove the 4 screws and life the plate off. That will bring up the fuel line & screen/check valve. Pretty simple really but I don't think the manuals cover it much.

You can check the voltage on your glow plug circuit wire before or after removing the glow plugs. If you have less than battery voltage at the wire that attaches to the glow plug then check it before (going in) and after (coming out) of the relay.
Still working on diagnosing my sky steer. It was kind of late when I started so I didn't get a whole lot done. I checked the voltage that goes to the glow plugs and it's good. I raised the cab to locate the fuel line. Doesn't seem to be quite like you (ajwgator) described. My fuel tank is behind the engine under the hydrostatic pump. I see a couple of hoses that I can get at. I'm guessing one is the suction. I don't see the plate with 4 bolts only hoses and elbows connected to the tank. I'll get back at it tomorrow. I'll trace the hose that goes to the injector pump. I hope I don't screw up. Wish me luck. and thanks for the help, everyone. Very much appreciated.

 

Jyuma1

Member
Joined
Oct 23, 2022
Messages
23
This may be of no value at all, but my Thomas T133 has always been a bear to start on cold winter mornings. Sometimes taking over an hour and a few battery jumps to get it going. Starting fluid is a no no with glow plugs but that didn't stop me from trying just a little spray anyway... no joy, ignites too easily causing piston to stop on the compression stroke with a clunk sound.

Then I stumbled on this simple method of getting stubborn diesels to start in the cold... a heat gun. I remove the air intake hose from the air filter to the intake and insert the snout of my heat gun into the hose leading to the intake. Turn on the heat gun (best to use low heat) and let it heat the intake for 10 minutes or so. Using the heat gun, the engine fires to life fairly easily... well, at least it does on my T133. An alternate method is to hold the glo-plug switch in the on position (manual momentary switch in my T133) for over a minute, preferably two.

If this method doesn't work, then the problem is fuel related. If it does work, then the problem is glo-plug circuit related.

Good luck.

A word of caution: Heat guns can get hot enough to melt the rubber of an air intake hose. A safer alternative is to use a hair dryer. Under no circumstances should you leave whatever pre-heating method you are using, unattended.
 
Last edited:

little_fellow

Well-known member
Joined
Oct 6, 2009
Messages
170
Raise the roll over cage, then there should be two metal plates screwed on top of the fuel tank. One for the fuel gage float/sender and the other one for the fuel line. Mine has four screws holding it on with a 90 degree fitting in the middle of the plate. Remove the 4 screws and life the plate off. That will bring up the fuel line & screen/check valve. Pretty simple really but I don't think the manuals cover it much.

You can check the voltage on your glow plug circuit wire before or after removing the glow plugs. If you have less than battery voltage at the wire that attaches to the glow plug then check it before (going in) and after (coming out) of the relay.

Still working on diagnosing my sky steer. It was kind of late when I started so I didn't get a whole lot done. I checked the voltage that goes to the glow plugs and it's good. I raised the cab to locate the fuel line. Doesn't seem to be quite like you (ajwgator) described. My fuel tank is behind the engine under the hydrostatic pump. I see a couple of hoses that I can get at. I'm guessing one is the suction. I don't see the plate with 4 bolts only hoses and elbows connected to the tank. I'll get back at it tomorrow. I'll trace the hose that goes to the injector pump. I hope I don't screw up. Wish me luck. and thanks for the help, everyone. Very much appreciated.

This morning I've been able to pull the fuel line out of the fuel tank and it looks almost like new and so does the screen, so I guess all that's left to do is wait for the new glow plugs to come in.
 
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