Rebuilding the Fuel System

Red90

Well-known member
You picture is a bit weird. There should be NTC2837, which is a square threaded plate. The "bolt plate" NTC2681 that you show goes in from the top and then NTC2837 screws onto that to hold it in place, forming a solid stud that you can then mount the tank to with a nut.
 

NPT90

Well-known member
You picture is a bit weird. There should be NTC2837, which is a square threaded plate. The "bolt plate" NTC2681 that you show goes in from the top and then NTC2837 screws onto that to hold it in place, forming a solid stud that you can then mount the tank to with a nut.

right, it looks like someone may have welded that plate on at some point.

Perhaps a previous repair
 

RBBailey

NAS-ROW Addict
Callsign: KF7KFZ
I think the highlighted square might be the spacer. But it's good to know that it goes in from the top, I think I might at least know what I'm looking at now.

I hope to get some work done on this tonight, then have it up and running by Friday.
 

Red90

Well-known member
Ah, I see it now. Yah, that is threaded on, so you need to unscrew if you want to replace.

NTC2837_1024x1024.jpg
 

Uncle Douglas

Well-known member
Callsign: delete
its spot welded, non removable

???
If oe, should only be welded on the side tanked 90's. 110 should only have adhesive spacer blocks between the tank and skid-nasty tar looking shite.
New tanks we have bought have not had the skids.
We routinely galv the skid and replace the tank with a new one, here's a pic from my half re-built NAS 110.
 

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Uncle Douglas

Well-known member
Callsign: delete
Nothing shows in parts book-page attached

Some have a tar like goo between the tank and the tank cradle, others the cradle drops and there is nothing between the two but rust. Not sure if it was intended to prevent abrasion between the two or meant to fill the space so that soil and water couldnt collect.

With my NAS 110, because I galvanized the cradle, I put it together dry with nothing between but I did coat the tank with bedliner first to prevent corrosion.
 

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RBBailey

NAS-ROW Addict
Callsign: KF7KFZ
The tank shield really does not want to fit. I doubt that even using spacers and such will make it wrap around the tank properly. Hummmmmm.....
 

RBBailey

NAS-ROW Addict
Callsign: KF7KFZ
The tab on the fuel tank opening only allows for the sender pick up unit to mount as seen here, is this correct angle?


Also, should I use any kind of sealant on the cork gasket up top? It will hold as is?
 

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RBBailey

NAS-ROW Addict
Callsign: KF7KFZ
So I've completed the install, but I can't get any fuel to come up into the lines. The sedimenter is roughly half way, and there is no fuel in it. There does not feel like any pressure at the lift pump (but I don't know what it should feel like, the Series is spring loaded) and opening the bleed screw at the filter does nothing either.


I've run out of fuel before, and when I cranked the engine, it very quickly pulled it up into the filter.
 

javelinadave

Administrator
Staff member
First off don't turn the motor over to prime the system, you will eventually kill your starter. If you have an electric fuel pump just make sure it is running and open up the bleed screw on the top of the fuel filter. If you don't, use some suction device at the bleed screw to draw up fuel AFTER you have filled up the filter with diesel.
 

Uncle Douglas

Well-known member
Callsign: delete
So I've completed the install, but I can't get any fuel to come up into the lines. The sedimenter is roughly half way, and there is no fuel in it. There does not feel like any pressure at the lift pump (but I don't know what it should feel like, the Series is spring loaded) and opening the bleed screw at the filter does nothing either.


I've run out of fuel before, and when I cranked the engine, it very quickly pulled it up into the filter.

you have to turn the engine with a socket until you find the point where the pump arm is off the cam lobe, then the lift pump lever will work
 

RBBailey

NAS-ROW Addict
Callsign: KF7KFZ
I guess there is some pressure in the lift pump, it's just at the bottom of the handle's travel, and doesn't seem like much. However, after turning the engine a few seconds to see if I could get some moving, I did pump for a while and got the sedimenter to fill up. But after several minutes of pumping by hand, the fuel is not coming up into the filter.
 

Red90

Well-known member
If you do not feel resistance the pump is either on the cam and you need to rotate the crank or the lift pump is dead.
 

Uncle Douglas

Well-known member
Callsign: delete
I guess there is some pressure in the lift pump, it's just at the bottom of the handle's travel, and doesn't seem like much. However, after turning the engine a few seconds to see if I could get some moving, I did pump for a while and got the sedimenter to fill up. But after several minutes of pumping by hand, the fuel is not coming up into the filter.

your pump is toast or you are leaking air prior to the pump.
 
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