Fuel temp sensor

[big blue dsl]

I have a question for all the obd1/2 guru's here in regards to the fuel temp sensor on my 95. I understand that it is part of the optical sensor in the top of the pump and that the ECM monitors the fuel temperature.

I know from experience with cat c15 engines that you could unhook the fuel temp sensor and connect a fixed value resistor in place to simulate hot fuel (thin) which would make the ECM inject a bit more fuel to compensate.

Is this something that our ECM has the capability of doing?

Would it affect any other functions in the ECM , like timing or idle etc?

Could it be done by selectively switching resistors up until the point of setting a code?

Or would after market chips already take fuel delivery to the pumps maximum delivery

What do you think....cheap few ponies?

 

[schiker]

I asked what the ECM does with fuel temp info and no one knew at the diesel page or place a long time ago. Jim did say that it will code at some pretty high temp like
278F ???? I can't remember the number. I think a normal reading is like 248F

I have wondered before if a small fuel cooler would be a good idea for a 6.5.

 

[Jamin6.5]

I have wonder the same thing about a fuel cooler. The big rigs all run them.

 

[schiker]

The newer higher pressure systems have to have them and are always on the return line I think.

In the 70's max recommended fuel temp at IP inlet was thought to be around 120F but Stanadyne designed out pumps to run on warmer thinner fuel. I don't think there is much gain unless maybe a tiny bit in an extreme climate towing case but I don't know and never read about any one trying to measure benefits or even trying a fuel cooler.

One reason I don't like to let my fuel tank get below 1/4 tank is so warm return fuel wont immediately recirculate. Seems I have read ideal fuel temp is like 70F at the IP inlet or that is the temp of the fuel they calibrate the pump.

 

[big blue dsl]

I was more after weather or not the ECM uses it for fuel delivery calculations