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  #1  
Old 12-05-2008, 03:19 PM
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Fuel line connection to IP

I started to smell diesel fuel driving to work yesterday and then at a stop sign noticed that the engine was running as though it was missing. Then noticed considerable lack of power. I took it to my indy who quickly spotted fuel squirting at the juncture of the fuel line from the IP to one of the injectors. The IP end of the line is a rounded end that fits down into the pump and is brought up tight with a nut. This rounded end did not seem to want to seal to the pump. There had been no recent work and all seperator clips were in place. It just started leaking all of a sudden. Ordered 2 replacement lines at $56 each. Any idea what would cause this?
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  #2  
Old 12-05-2008, 03:49 PM
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I wasn't even going to ask, but did YOU try tightening it?
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1985 Euro 300TD 5 spd 220K
1985 Euro 240D 5 spd 130K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
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  #3  
Old 12-05-2008, 06:02 PM
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Yes

Tightened. Repositioned and tightened. No joy.
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  #4  
Old 12-05-2008, 06:46 PM
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This happens to all Diesel Engines that have Hard Lines to the Injectors ounce and awhile (I replaced 1 one my Volvo).
The longer and thinner the Hard Lines are the more they are prone to cracking.
There has been at least 5 cases in the last 300 or so days on the Forum with cracked Hard Lines.
The biggest cause is vibration (make sure all of the Hard Line Clamps are present and where they are supposed to be; sometimes they vibrate off while driving or the PO misplaced them).
When I was in Trade School I was told that there is at least 2 big pressure waves created in the Hard Lines. 1 when the Fuel is 1st starting to push through the lines and another when the Injector Spray Nozzle closes shut. The shutting of the Spray Nozzle causes a pressure wave to go backwards through the Hard Line.
Now picture this; the Spray Nozzle closes sending a pressure wave backwards (remember the length of the Hard Line Tubing); the backwards pressure wave has not reached the Fuel Injection Pump yet but by now the Fuel Injection Pump is starting to inject Fuel creating another pressure wave going forwards towards the backwards pressure wave! Think of the stress that the 2 pressure waves cause when they meet inside of the Hard Lines.
If your Engine ran at one speed it would be easy to design Hard Lines that would have no problems. (Designers usually try to keep the Hard Lines as short as possible.)
If you look in the Bosh books on Fuel Injection Pumps you will see that they have been trying a bunch of designs of Delivery Valve/spring setups to help cope with the problem but as you see there is no 100% solution.
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  #5  
Old 12-08-2008, 11:52 AM
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New hard lines for #4 and 5 arriving today.

As I said there had been no recent work since the dealer put on a replacement -22 head last winter for the -22 head that cracked. At that time the dealer also resealed the leaks on the IP that had been replaced 6 months previousl to the head. Some of the fuel line clamps were not correctly positioned or inserted completely. So much for dealer expertise!
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87 300D 265Kmi
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  #6  
Old 12-08-2008, 11:58 AM
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Would you mind posting which dealer, I dont generally use them but sometimes you don't have a choice. "So much for dealer expertise!" For sure
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1985 Euro 300TD 5 spd 220K
1985 Euro 240D 5 spd 130K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"
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  #7  
Old 12-08-2008, 01:48 PM
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Don`t the new lines need flushing before installation?
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  #8  
Old 12-08-2008, 06:28 PM
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Quote:
Originally Posted by vox_incognita View Post
Don`t the new lines need flushing before installation?
Excellent reminder!
Spray can type Carburator Cleaner with the skinny tube attached or the same but Brake cleaner followed by compressed air from an air gun to blow the lines out good is what I have used in the past.
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