Injection pump hard lines leak

Cole250 · Jan 22, 2022

Hi guys

Got a 94 f250 7.3 n/a. Have a major fuel leak on top of the engine. Just ordered a new return line kit to knock out most of the leaking. Still having issues with lines coming right off the pump. Was wondering if there was any tricks to stop leaking off the pump. Below I circled the line with the slow drip Thanks.

gnathv · Jan 22, 2022

Did you try to tighten it? It may be just the way it’s seated. Loosen the nut move the line slightly to center it in the nut and snug it back down. If that doesn’t do anything, take the line off and clean, polish the nipple on pump and clean, polish the seat of the line. Don’t let any grit or dirt get in pump or lines. If that still doesn’t do it you’ll probably have to replace the line. Good luck. Don’t overtighten.

Cole250 · Jan 22, 2022

gnathv said:
Did you try to tighten it? It may be just the way it’s seated. Loosen the nut move the line slightly to center it in the nut and snug it back down. If that doesn’t do anything, take the line off and clean, polish the nipple on pump and clean, polish the seat of the line. Don’t let any grit or dirt get in pump or lines. If that still doesn’t do it you’ll probably have to replace the line. Good luck. Don’t overtighten.

I did try to tighten it, barley turned and still dripped after. I’ll definitely try what you said. Thanks!

sjwelds · Jan 22, 2022

Cracked line is a possibility, though that usually happens at the injector end. All four line clamps in place?

ROCK HARVEY · Jan 22, 2022

sjwelds said:
Cracked line is a possibility, though that usually happens at the injector end. All four line clamps in place?

This was my thought too. Are you sure that it’s leaking from the connection and not a tiny crack somewhere?

Cole250 · Jan 22, 2022

ROCK HARVEY said:
This was my thought too. Are you sure that it’s leaking from the connection and not a tiny crack somewhere?

All clamps in place. 100% sure. I watched it slow drip where I circled in the picture above.

mexicanjoe · Jan 24, 2022

May I add that you can try to wrap the nipple with about 5 turns of teflon tape. Ive used it in high pressure gas lines in the oilfield and can attest that it will not blow out even with super high pressure. Weve used it as a gasketing material on several connections. Its worth a try....

gnathv · Jan 24, 2022

The problem is not the threads, it is the connection between the tube seating face and the nipple seating face. If you try to put Teflon in that area you risk debris into the injector. I don’t think its a good idea.

Kalmanto · Jan 24, 2022

Personally I'd replace the line(s). 25+ years of vibration will cause metal fatigue. You can buy them each or kit. Or take the line to a hydraulic shop and ask them to make one.
Just my half thoughts.

franklin2 · Jan 28, 2022

I can't find the diagram I had, but make sure ALL the line clamps are in place, I think there are 4 of them. I left one off and I had the same problem you have, the line had a hairline crack right at the injection pump. They have a ball formed in the line where it seals and the crack was right beside the ball on the line.

Old Goat · Jan 28, 2022

Here ya go.

IDI (6.9 or 7.3) Injector Line Order at the IP - IDI Online

This article contains the injector line order for a 6.9 or 7.3 IDI injector pump. This is important information if you have removed all your injector lines and forgot how to put them back together. Also, this is useful if the previous owner has ****** something up, as typically happens with...

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Goat

Injection pump hard lines leak

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IDI (6.9 or 7.3) Injector Line Order at the IP - IDI Online

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