Fuel sender MF35 vs MF 135

Anyone know why?

Thanks,

Mark

Problem with tank is that it is only 5" deep where the sending unit mounts. That means a very short wire to the float. Must be why they recommend OEM instead of aftermarket.

Won't believe this but I got everything adjusted to work up and down in 5" on the bench and installed the unit. Tank was half full, but gauge read E.

Investigation revealed that, due to the short distance from the resistance element to the float, the float didn't have enough ballast to float the interconnecting parts. You know, the old foot/lbs things. No feet (short rod) so need lots of lbs of lift.

Oh well, this afternoon I may take the float off the old one and see if I can get rid of some metal on the arm and reduce the weight so that it'll float. Otherwise it works fine by hand..... just gotta get the float to float.

Also, the hole to insert it is not that large so I can't add another float to get double the lift.

Mark

If not it's as you say...off to NAPA for a generic.

Thanks,

Mark

Some gauge systems increase the sender resistance when the tank's level goes down, some increase the sender resistance when the tank's level goes up. GM versus Ford. Then within the direction type they use different resistance ranges. You might have to buy a MF-135 gauge to go with the MF-135 sender.

You can test the gauge and sender combination with the sender loose, just connect the gauge wire to the terminal on the sender and hook a wire from the flange to the tractor chassis. Then watch the gauge as you move the float wire about.

I had troubles with an old sender, but after I took it out of the tank, cleaned up the surface of the resistor and added a tiny bit more tension to the wiper its been working ever since. In my MF-135 I replaced the leaking brass float with a cork coated with SealAll and its been working nicely ever since.

When there is a soft gasket between the sender flange and the tank, over time that will give under the pressure of the screws and you can loose the ground connection to the sender. Sometimes a sender goes back to work with nothing more than tightening the mounting screws. I'd prefer there was a separate ground wire though.

Gerald J.

I hope the only problem is depth. I can fix that easily. Resistance is known (30 to 240) and the larger number is empty.

After installing a new gauge, the old one worked from half to full but below half it was kaput.

Thanks,

Mark

Thanks,

Mark