NHC 250 Fuel fitting size

[ke5eua]

This is driving me crazy trying to find the correct fitting size for the ip inlet.

I picked up a diesel pump and I know I need to get some reducers and adapters to make it work inline with it.

Specs of the pump I got:

24 Volts
DIESEL
Negative Ground
1/4-18 NPSF fittings
10 to 14 PSI
35 GPH at free flow

So I need to go from 1/4-18 male to ip size female and ip size male to 1/4-18 male

I'm loosing prime, and I am going to redo the seals in the selector switch, and new lines eventually.

I want the pump for the cold winter days when the fuel is a little thicker, and when I do fuel filter services and need to bleed the system, or long idle times.

 

[MyothersanM1]

Here's the 90° inlet fitting specs. I know for sure the connection from the filter is a 1/2" male inverted flare.
http://www.parttarget.com/4730-01-078-0682_4730010780682_203848.html/-EC4131CC-8A91-4303-B0FA-77EB58297054

Is the pump you're putting on one of those inline types...?

I use a similar type to transfer from my right tank to the left and it works just fine. My concern with your install is the inlet size tubing is all 1/2" from the tank to the IP on the NHC250 engines. You're probably going to end up starving the engine of fuel with the smaller 1/4" pass through with that pump.

 

[ke5eua]

Here's the 90° inlet fitting specs. I know for sure the connection from the filter is a 1/2" male inverted flare.
http://www.parttarget.com/4730-01-078-0682_4730010780682_203848.html/-EC4131CC-8A91-4303-B0FA-77EB58297054

Is the pump you're putting on one of those inline types...?
View attachment 506522
I use a similar type to transfer from my right tank to the left and it works just fine. My concern with your install is the inlet size tubing is all 1/2" from the tank to the IP on the NHC250 engines. You're going to end up starving the engine of fuel with the smaller 1/4" pass through with that pump.

That's the pump. Do you know the flow rate and psi going into the ip?

 

[MyothersanM1]

That's the pump. Do you know the flow rate and psi going into the ip?

I don't see the specs in the -34-1. Send a PM to Brother WillWagner. He's a Cummins guru. I'm sure he can get the specs.

 

[ke5eua]

Got the info. The flare fitting coming off the elbow on the filter to the ip is 5/8 flare.

Ended up going 5/8 flare to 1/4 mip for my project. Just have to get 4 more 1/2" couplers and as soon as the other pump gets in and I get another hose I'll be all set. I'm also going to add two more 1/2" street elbows to the 5/8 fip to 1/2 mip to keep the fuel line off the surface of where it gets mounted.

The 4 small double males were bought in mistake, those should be the double females I need to get now.