6.9 vs 7.3 injection pump, any differences? - Ford Truck Enthusiasts Forums

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6.9 vs 7.3 injection pump, any differences?

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6.9 vs 7.3 injection pump, any differences?

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Old 11-13-2007, 10:29 PM
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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.
 
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Old 11-13-2007, 10:42 PM
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7.3 inj. require higher pressure so probably will work don't know if it will hurt injs. or not.
 
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Old 11-14-2007, 06:52 PM
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was hoping somebody with better info would chime in.I would like to know too.
 
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Old 11-15-2007, 06:45 AM
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I have a 7.3 parts truck too... and have the same question. My brother looked at it's injecters and found them to be identicly numbered to the injecters in my 6.9.
 
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Old 11-15-2007, 10:21 AM
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Probably work, the injector codes changed to E in 1992.5 with either the 5013 or 5028 IP.

Before that B,BB,C or D injectors are listed for all IP's from 1984 thrugh 1992.
 
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Old 11-15-2007, 10:33 AM
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Dave that means a 6.9 ip would work on a pre 92 7.3 then an I reading this right.
 
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Old 11-15-2007, 04:18 PM
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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.
 
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Old 11-15-2007, 04:32 PM
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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.
 
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Old 12-10-2007, 09:43 PM
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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.
 
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Old 12-10-2007, 10:35 PM
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You can get 10+ HP and even more torque with exhaust and intake mods, no fuel system changes needed.
 
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Old 12-13-2007, 06:08 PM
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i got a 6.9 pump on my 7.3 and runs pretty darn good so i imagine that a 7.3 will work fine on a 6.9.
 
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Old 12-13-2007, 08:42 PM
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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.
 
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Old 01-15-2016, 05:41 AM
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No I didn't take the gear housing off only thing was the filler neck. Could it be that the pump was off a 7.3 and it's flooding the motor.
 
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Old 01-15-2016, 08:20 AM
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Going to need a little more info on your problem? You "cant" flood a diesel...
 
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Old 01-15-2016, 08:38 AM
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Originally Posted by hairyboxnoogle View Post
Going to need a little more info on your problem? You "cant" flood a diesel...
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
 
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