Archived fuel sending unit instal question

[Jff24Gordn]

I know I am putting this in 911, and my fuel gauge hasnt worked since spring 99, but i already had the parts and the tank started to leak.

Ok, so I got the tank out and the assembly out. The bottom part slided seperate from the top by 3 screws on slotted holes. The bottom half will move up and down from the top half. the 3 screws have wore kind of deep around the metal slots. Should these screws be tight enough so it wont move seperate from the top half, or loose enough so it will move up and down?

 

[Loren]

Jff,



The 1995 service manual doesn't say whether or not that part should slide, but the one on my 1995 truck did when I took it out to replace the fuel quantity sending unit.



I installed it with the part sliding up and down and have had no problems with it.



I assume that it's supposed to slide so that the bottom of the module will ride on the bottom of the tank, thereby giving the most accurate fuel quantity readings as the tank nears empty. That's just a guess, but it makes sense to me.



I'd allow it to slide.



Loren

 

[Jff24Gordn]

Well, I put it back in like it was. I didnt find the leak I was chasing. I had the end with fuel on it down with enough fuel to cover where the hole could be, and pressureized the tank to the point where it was round, and no leak. Maybe someone was playing a joke on me.

 

[Andy Redmond]

I like them to slide. I usually clean up the burrs and tighten them slightly to prevent any binding.



Are you sure the tube "coil" wasn't chafing on a sharp screw?



Also, I think you have a 12V?



If so, check to see that the fuel heater is tight to the bottom of the pre-filter base. Once the cup is dropped down you can insert a 5/16"/8mm hex into the bottom of the heater and tighten slightly. I see many air leaks here. .



The sealing o-ring is available from Cummins (Fleetguard).



Good luck, Andy

 

[bighammer]

I think it's just for allowances in different tanks. (since they are plastic) It should sit on the bottom, but it looks like they tend to bounce up and down and wear away at things. I don't know if setting it rigid is a good idea. It may wear on the bottom of the tank. (more than it does already) Maybe some nylon washers?

 

[Jff24Gordn]

ok, the leak I was chasing was in the tank on the top under the cab, not a line. But I couldnt force fuel through the tank there, so it aint leaking there. I was only gonna fix it so Brian didnt DQ me at a race. I slightly damp spot on the top/side of the tank wasnt gonna catch on fire anyways.