Injection pump inlet issues

[OldIron82]

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Due to my inability to get a nice built turbo 6.9 ( no one will argue I didn't try like hell!!! ) I am faced with no choice but to fix the starting problem on the NA 7.3 in my 89f350 dump. I cant keep winding it up with a can of crack each time. I'm beginning with the pump, with at 130,000 will not start when heat soaked causing for more ether assisted starts which have a small success rate of not lighting waaaaay too early and giving the dreaded knock sound. The pump I'm attempting to install is a 30,000mi pump from the 83 6.9. Unfortunately the ends are different. I don't want to go bending the crap out of my filter-to-injection pump line to make it work. This elbow in the first picture, does anyone know if they make it in a straight? As in not a 90° bend? I believe it's a NPT to compression fitting fine thread adapter. Does such a critter exist? Thanks

OI82

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[icanfixall]

The threads on the end of the injection pump are 12x20 threads and that fitting requires an o ring to seal correctly. I have never seen the fitting you have in that pump. Any injection pump rebuild shop will have the special brass fitting you need so you wont be bending lines. BTW that feed line is 5/16 from the filter exit to the injection pump inlet.

 

[OldIron82]

Shoot! The first picture is the 7.3 pump. The second pic is the 6.9 pump, and the 3rd picture is the fitting unscrewed from the 6.9 pump. The fine threads are the same from pump to pump ( 12 x 20 you said? ) just it's on this stupid 90°elbow that screws into the pump with tapered NPT. By o-ring I hope to Christ you mean one of those so called olive washers I got in my return line repair kit from Conestoga Diesel?

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[IDIoit]

1/2" x 20, also known as National Machined Pipe Thread.
it seals with an o-ring like Gary said.
ive switched to AN feed lines.
CDI sells this line.

 

[towcat]

Shoot! The first picture is the 7.3 pump. The second pic is the 6.9 pump, and the 3rd picture is the fitting unscrewed from the 6.9 pump. The fine threads are the same from pump to pump ( 12 x 20 you said? ) just it's on this stupid 90°elbow that screws into the pump with tapered NPT. By o-ring I hope to Christ you mean one of those so called olive washers I got in my return line repair kit from Conestoga Diesel?

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olive=yes.
do you have a bad fitting or line?
the pump that is not starting when heat soaked, will not start with either. the fitting on the end of the 7.3 pump should adapt over to the 6.9 pump with no issue. you need to remove the fitting the elbow screws onto.

 

[riotwarrior]

I am not sure what your line from filter to IP looks like but fitting on RED cloth is the fuel inlet to 7.3 filter fitting.

The top IP has correct 7.3 fitting needed if you have a 7.3

The lower IP has a brass fitting into an adapter...that adapter and brass fitting need to be replaced by the single fitting in the 7.3 pump...if that is the dead pump for it to conmect to your 7.3 engine.

 

[typ4]

What He said^^^^^^ And the pump is 1/2 20 NF thread , like a bolt, because its a hyd o ring fitting. Like the AN fittings.

 

[icanfixall]

Both typ4 & riotwarrior are correct about the fitting. The top pump fitting is what we consider to be correct for the idi engine and it has an olive that fits into the tube end you can see. But the fitting ALSO has an o ring that seals this fitting to the pump.

 

[OldIron82]

So the lower pump fitting will simply unscrew and I can swap the upper old 7.3 pump fitting with a simple o-ring? I want to make sure before I start wrenching on things. Thanks everyone.

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[riotwarrior]

Take the piece circled in blue out from 7.3 pump.......

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Save this fitting....there should be a replaceable O ring under hex of fitting...that needs to be replaced.

Now remove the 2 fittings circled in red....then take fitting from above blue circle with the new O ring and stick into pump to replace the 2 incorrect fittings.

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Thats it...now yer 6.9 pump will fit the 7.3 line...dont forget new olives too

JM7.3CW

 

[OldIron82]

Got it! Woo hoo! Put a socket on them and gave a firm but gentle tap with a hammer on the ratchet and they broke loose. I see the o-ring. There is one smaller o-ring in the kit I got from Conestoga that I couldn't figure out where out went. I'm willing to bet that's the one I need. Many, many thanks.

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[icanfixall]

Yes... That is where that o ring from Mel ends up. See how well Mel treats his customers. Now if we can get hime to supply a parts list of what ahd where things go this would be the icing on the cake...

 

[gandalf]

Making good progress here. Once you've got things done as specified above. you're ready to connect the IP to the Fuel filter. Almost everybody uses the stock hard line Ford used. The alternative is a stainless flex line which Mel will be happy to sell you.

I'll attach a picture here, one which I've used many times, one which I took when I changed out the IP on my truck. This is the hard line running between the fuel filter and the IP. You can see the end which attaches to the IP. An old olive is on the line, and a new olive is sitting beside, at the arrow point. You can see how the get old and misshapen. Any time you loosen the fitting it is best to replace the olive.

 

[OldIron82]

I will be tearing into the olives tomorrow. Thanks Gandalf.

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[riotwarrior]