6.9 vs 7.3 injection pump, any differences?
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Senior User
Joined: May 2005
Posts: 129
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From: spokane WA
6.9 vs 7.3 injection pump, any differences?
I have a non turbo 7.3 injection pump as a backup pump for my 84 6.9. Is there any difference I should be worried about.
I need to put this on until I get a rebuilt one to replace my whacked current one.
I need to put this on until I get a rebuilt one to replace my whacked current one.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
There were six injection pumps used from 1984 thru 1992.
Most of the changes to the IP were for tighter emission standards.
Yes any injection pump from 1983 thru 1994 with any injector combination A,AA,B,BB,C,D,E,G will run.
How well it will run if the injectors and IP are not matched is another question.
There was a 10 HP difference between the 6.9 and 7.3 NA motors.
A 7.3 with a 6.9 IP would probably loose a few HP.
But yes it would run.
Most of the changes to the IP were for tighter emission standards.
Yes any injection pump from 1983 thru 1994 with any injector combination A,AA,B,BB,C,D,E,G will run.
How well it will run if the injectors and IP are not matched is another question.
There was a 10 HP difference between the 6.9 and 7.3 NA motors.
A 7.3 with a 6.9 IP would probably loose a few HP.
But yes it would run.
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Post Fiend
Joined: Oct 2007
Posts: 10,501
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From: Faibanks Ak.
thanks I was wandering about that as I only have one 7.3 motor but a couple spare 6.9s.
Do you think you could pickup part of that 10 hp by going to 7.3 ip and injs what is the differance in torque as hp don't mean much to me.
Do you think you could pickup part of that 10 hp by going to 7.3 ip and injs what is the differance in torque as hp don't mean much to me.
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Thread Starter
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Senior User
Joined: May 2005
Posts: 129
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From: spokane WA
Finally got around to switching these IP's. The IP I put on is from an 89 or 90 7.3.
Dang thing runs good. I don't think the cold start advance is working but once I got it timed a bit closer to where it should be it sure runs good.
I was having smoke at idle, and bad cold start smoke before, along with several intermittent running issues.
All that is gone, no smoke, starts much easier, runs smoother.
This was an $8 injection pump from my local self serve wrecking yard.
It started this morning at 15 degrees with no block heater and only about 8 or 9 seconds on the glow plugs. I am tickled pink.
Dang thing runs good. I don't think the cold start advance is working but once I got it timed a bit closer to where it should be it sure runs good.
I was having smoke at idle, and bad cold start smoke before, along with several intermittent running issues.
All that is gone, no smoke, starts much easier, runs smoother.
This was an $8 injection pump from my local self serve wrecking yard.
It started this morning at 15 degrees with no block heater and only about 8 or 9 seconds on the glow plugs. I am tickled pink.
Posting Guru
Joined: Oct 2005
Posts: 1,030
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From: Powell River B.C.
I believe that the plunger pistons in the 7.3 pumps are bigger diameter, so the effect or running a 7.3 pump on a 6,9 would be the same net effect as turning up the fuel screw a bunch- may provide too much fuel, but will run great- with lots of smoke at WOT, and CAUTION: watch your EGT's.
New User
Joined: Jan 2016
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I posted on wrong thread but anyway my 85' 6.9 ip was leaking so I replaced it with a 7.3 ip I found and now the truck starts and idles but when you start getting the r's up it it smokes extremely bad and wants to die I marked the timeing before I took the other one off and put it back in the Same way