Leaky Injection Pump - Dodge Cummins Diesel Forum
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post #1 of 19 (permalink) Old 04-15-2019, 12:15 PM Thread Starter
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Leaky Injection Pump

I bought my 92 w250 a couple months ago and have started to do all the preventative maintenance. Started with simple oil change, bought the KDP kit and doing that this week.

Decided to replace fuel filter, primed it, and after starting it up the injection pump is now weeping diesel fuel.

Did I do something wrong, or is now the free flow showing the age of the o-rings?

Full disclosure, the PO had the RPM spring and fuel pin replaced. Not sure if this is causing any of the problems.

Any help appreciated, this needs to haul ready in less than 3 weeks.

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post #2 of 19 (permalink) Old 04-15-2019, 02:17 PM
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Need to know where it's leaking fuel from, there are only about 4 to 6 common places it leaks. Picture would help.

84 K5 Blazer 97 12v, 47re with E-TransControl, Dodge Dana 60 with free spin hubs, Dana 70, B&M Mega shifter

96 F350 SC dually zf5, 4x4, 92 Cummins, THD 5x12's, THD fuel pin, THD HVLP with adjustable fuel pressure mod, WM, h1c 60/60/12cm WG wired
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post #3 of 19 (permalink) Old 04-15-2019, 05:45 PM Thread Starter
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It’s coming from under the spring on the left
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post #4 of 19 (permalink) Old 04-15-2019, 06:16 PM
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The throttle shaft? Do you add lube to your fuel?

84 K5 Blazer 97 12v, 47re with E-TransControl, Dodge Dana 60 with free spin hubs, Dana 70, B&M Mega shifter

96 F350 SC dually zf5, 4x4, 92 Cummins, THD 5x12's, THD fuel pin, THD HVLP with adjustable fuel pressure mod, WM, h1c 60/60/12cm WG wired
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post #5 of 19 (permalink) Old 04-15-2019, 06:43 PM Thread Starter
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No I don’t. Didn’t know that was a thing. Would it leak badly from a lack of lube? That doesn’t sound right.
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post #6 of 19 (permalink) Old 04-15-2019, 06:53 PM
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when did ya install the governor spring? that woulda been the time to replace the throttle shaft o ring, adding lube ie; 2 cycle oil can help keep o rings from drying out, if ya don't want to wait and see if adding lube gets the o ring to stop leaking then ya will need to pull the AFO cover again just like was done to swap springs, pull the throttle shaft and install a new o ring on it also a good time to replace the slide pin o ring too but that requires additional disassembly of the AFO housing (top of pump) btw if it doesn't have a new seal in it already for that AFO ya should swap it too as mine was leaking like crazy thought it was multiple o rings turned out it was that covers gasket... they get compressed over time mine was so flat ya could not feel any difference when running a finger over it
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post #7 of 19 (permalink) Old 04-15-2019, 06:58 PM
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Quote:
Originally Posted by jacks47 View Post
No I don’t. Didn’t know that was a thing. Would it leak badly from a lack of lube? That doesn’t sound right.
These IP's use O rings for the moving parts and without some lube in the fuel they dry out. When I got my truck back in 2010 the throttle shaft seal was leaking and I bought a seal kit DGK121 and decided to add some lube before installing it. After the first tank of fuel the leak stopped and I never did have to use the seal kit. In 2016 the big O ring around the distribution head started leaking bad and decided to have a shop rebuild the IP.

https://www.walmart.com/ip/SuperTech...c-Jug/16913695 This is what alot of people will use i'd suggest putting 2 16 oz bottles in and fill up the fuel tank for the first time. Then after that at least 1 bottle per tank of fuel, but I always say you can't use to much. Myother4x4 also had that leak on the throttle shaft and he started adding lube to his fuel and it stopped.

There's a small pin at the bottom of the AFC that rides on the fuel pin profile, it has a O ring also and it is known to stick and or leak fuel.

84 K5 Blazer 97 12v, 47re with E-TransControl, Dodge Dana 60 with free spin hubs, Dana 70, B&M Mega shifter

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post #8 of 19 (permalink) Old 04-16-2019, 01:21 AM
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If your fuel is bio-blend, it has more lubricity than any amount of 2 stroke oil can provide, so it’s futile to add at that point. I say this because it seems MOST places nowadays have the “contains atleast 5% biodiesel” stickers on the pumps.

Just removing the AFC top you can knock out a few of the leak prone seals. The throttle shaft oring and the slide pin oring especially. Add the fuel screw o ring and the seal between the top and case and you’ll probably be set for happy leak free cruising.
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post #9 of 19 (permalink) Old 04-16-2019, 08:10 AM Thread Starter
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The previous owner had the spring installed and I'm guessing seals were not replaced at that time. I'm ordering the gasket kit and will try the 2 cycle oil trick.

Quote:
Originally Posted by monsoon-mech View Post
when did ya install the governor spring? that woulda been the time to replace the throttle shaft o ring, adding lube ie; 2 cycle oil can help keep o rings from drying out, if ya don't want to wait and see if adding lube gets the o ring to stop leaking then ya will need to pull the AFO cover again just like was done to swap springs, pull the throttle shaft and install a new o ring on it also a good time to replace the slide pin o ring too but that requires additional disassembly of the AFO housing (top of pump) btw if it doesn't have a new seal in it already for that AFO ya should swap it too as mine was leaking like crazy thought it was multiple o rings turned out it was that covers gasket... they get compressed over time mine was so flat ya could not feel any difference when running a finger over it
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post #10 of 19 (permalink) Old 04-16-2019, 08:21 AM
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Quote:
Originally Posted by jacks47 View Post
The previous owner had the spring installed and I'm guessing seals were not replaced at that time. I'm ordering the gasket kit and will try the 2 cycle oil trick.
Listen to what your engine sounds like idling before and after adding the lube when it's gotten a few miles on it. You should notice it idling a little higher and not as noisey. You could also just use a qt of cheap engine oil, or Biodiesel like Justin said just as long as it's something that will lube.

84 K5 Blazer 97 12v, 47re with E-TransControl, Dodge Dana 60 with free spin hubs, Dana 70, B&M Mega shifter

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post #11 of 19 (permalink) Old 04-16-2019, 04:07 PM
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Quote:
Originally Posted by justinfonder View Post
If your fuel is bio-blend, it has more lubricity than any amount of 2 stroke oil can provide, so it’s futile to add at that point. I say this because it seems MOST places nowadays have the “contains atleast 5% biodiesel” stickers on the pumps.

.
Interesting point I had not thought of that.

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post #12 of 19 (permalink) Old 04-16-2019, 07:22 PM
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With the Bio, that will supply the lubricity but doubt it will have the same effect on O rings as mineral oil.
Cheers Steve

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