Bleed fuel system on IH 175C

jacks

Member
I ran my IH 175C out of fuel recently (I know-bad mistake and I will
be more careful in the future). It is sitting in the shed with the
loader arms down, which blocks off any direct access to the fuel
filters. I have refilled the fuel tank to the top. The fuel line
goes to a sediment bowl underneath the tank, then to the primary
secondary filters. The filters are mounted on the lower left side of
the block (it has a DT466). The fuel line goes in and out of the
primary filter, then to the fuel pump which is mounted to the side of
the injector pump. From the fuel pump, the line goes to the secondary
filter, and then to the injector pump. There only a bleed screw on
the top of the secondary filter, but I can't reach it with the loader
arms in the way. There is good access to the injector pump, and it
has a manual pump integral to the fuel pump. I loosened the fuel line
at the fuel pump downstream from the primary filter, but am not
getting a good flow of fuel there, it is only slowly dripping. If I
could apply a couple of psi pressure to the fuel tank, I think it
would push fuel to the fuel pump which would let me use the hand
primer to finish bleeding the system. Alternately, I could cut the
primary fuel tube upstream of the fuel pump and install an electric
pump or maybe a manual primer pump of some type. Any suggestion or
advice on how to get fuel through the primary filter and up to the
fuel pump would be appreciated.
 
cut a section of inner tube with the fill valve and clamp it over the tank fill neck---pressurize to no more than 5 psi
 
The pressurizing idea sounds useful. I have found that when running out of fuel (or any other reason for a break in the fuel flow) it can be quite difficult to get fuel to flow through the wet filters again and needs a bit of pressure from the tank end. And I'm sure the tube and valve idea would taste better than just blowing into the tank filler! (Been there done that but works)
 
Thanks, that sounds like a pretty easy way to pressurize the tank. I will give it a try tomorrow.
 
yes i do that to my old Cats---saves running the pony engines for a long time---I actually bleed thru the whole system right up to the injectors
 
I guess that it is ok to crank the engine with a few psi of pressure applied to the tank and the injector nuts cracked?
 
I used a piece of old inner tube to pressurize the tank this morning and I was able to push fuel through the primary filter and on to the pump. I used the hand primer pump and bled the secondary filter the best that I could. I cracked a couple of injector nuts and cranked it over while keeping a little pressure on the fuel tank. It fired off right away only missing on the injectors with the loose nuts. Thanks for posting that tip dpendzic.
 

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