Ford 172 diesel Question

Darryl 2Ms · May 24, 2016

Hey guys, working on an 861 with a 172 diesel engine. Has a Roosa master pump which has 2 badly deteriorated rubber fuel lines. One from the fuel filter coming from the rear of the tank,
and one which leads to the front of the tank. I'm assuming that's a return line. My question is , if I pull the return line( which looks worse than the other) will I have to somehow bleed
the system? And how would I do that? Looks like some sort of bleeder screw on the fuel filter body. Need to get this fixed, hay season is fast approaching here in upstate New York! All
help is welcome and appreciated. Thanks guys.... Darryl

Dieseltech · May 24, 2016

Pump is self bleeding, but will need the injector line nuts loose with the engine cranking to get fuel to the injectors if it's run out of fuel, or at filter change for example.

Larry NCKS · May 24, 2016

If you do the return line quickly enough, you may not have to bleed the injector lines.

Colin King · May 24, 2016

The return line coming from the pump to the front of the tank (radiator side) can easily be replaced. No bleeding required. However, you'll want to have everything ready to install when you remove the line, as there is no shut off. Any fuel in the tank will drain from the open hose.

Replacing the tank to filter/pump line is also quite simple. It's gravity fed to the filter and pump. The filter base has an accumulator which draws extra fuel as needed. Just remove the lines you need to and replace them. Use the fuel shut-off at the base of the tank.

I have never had to bleed the injectors after replacing the fuel line (I've now had mine apart a half dozen times or more at this point). But if you find that you need to, you can use the bleed screw at the top of the filter housing to let a bit of fuel out. If you do need to crack the injectors, carefully loosen the brass nut until fuel starts to squirt from underneath the nut while cranking the engine. Once you have a good strong squirt of fuel from each injector, tighten them up again.

Colin, MN

Darryl 2Ms · May 25, 2016

Thank you, thank you, thank you guys. I always get an answer on this site. The people on here are the best. Sounds like an easy procedure. Didn't notice any bleeders on the injectors, like on my TD6. Didn't think to just crack the nut. I always learn something here. Great!! Back to wrenchin' Darryl

Ford 172 diesel Question

Darryl 2Ms

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Dieseltech

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Larry NCKS

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Colin King

Well-known Member

Darryl 2Ms

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