Hi everyone im a noob when it comes to diesel, i can do a lot of hands on mechanics myself . That being said , i have a 1990 7.3 idi non turbo , recently i installed a duralift facett electric feul pump as i was having air in the feul and bleed down issues.
Prior to the electric pump , i also replaced the return feul lines , all new caps , orings .i took the lift pump off the block and used a big block chevy plate to seal the hole.After Installing the feul pump i discovered that my dual tank crossover valve was faulty , it was allowing a lot of air into my system , losing prime and hard start.
i removed all the injectors , had them tested , was told none of them popped , and the spray patterns were all over the place , but none were stuck open . So i put them back in while waiting for brand new ones to arrive .
when i installed the electric pump , i ran all new 3/8 lines to and from the front tank , cutting out the dual system alltogether . There are no leaks in the lines now . The electric pump is a Facett Duralift 40222 9-11.5 psi as reccommended on threads on this site . After installing the pump , the truck started really well and ran excellent .
being that i was told all my injectors failed the test, i oredered new ones .
this weekend i installed the new injectors very carefully to ensure no dirt touched the tips , after installation , the electic pump primed the system very well , and after 5 turns she fired up .
here is my dilemma , the truck is blowing massive amounts of whitish exhaust with a heavy smell of feul. Im assuming this is unatomized feul ? It idles smooth until i crack one injector to bleed air , then begins to idle rough .
i have tried cracking each injector and closing it one at a time till all of them were covered .
if i accelerate the ip more whitish exhaust , i let it run for a good 15 min and no change .
im wondering if maybe the electric feul pump is causing too high feul pressure , or is my ip just not up to feeding new injectors?
is it possible at some point the previous owner may have adjusted the timing to run better on bad injectors ?
any help , ideas , greatly appreciated .

 

If you are getting white smoke that is excess fuel. Where the injectors new or rebuilt ? For the few dollars more you are better off getting new Stanadyne injectors

 

Yes i bought brand new Stanadyne . They had april and May 2018 stickers on the boxes .

 

 

try adjusting the timing one dimes width at a time to see if it helps..i would first retard it,
just keep track of the starting point so you know where you started from.

 

If it is blowing white smoke from injection timing that is cause it is too far retarded, Retarding it further will make it worse.

Advance the timing the dimes width. With the old worn injectors they may have retarded the timing as they were likely opening to soon. You did say they never really popped...

I would take it in and have it timed to be honest, if you do not have a diesel injection timing kit.
As they will be able to dial it in with your new injectors.

Mech pumps wear over time and the timing changes regardless. Also be aware that old pumps can sometimes fail after new injectors are installed I have had this happened a couple times, it is more common with the P style pumps than with rotary pumps, but can still happen with rotary pumps.

Generally on the 6.9 and 7.3 IDI the DB-2 Stanadyne rotary fuel injection pump has a lifespan of about 100K miles now (like the injectors) and should be re-maned at that point or at the very least the operation checked. Do not be surprised if the pump is done for.
These pumps relied on the sulphur in the fuel to help lubricate them, now with ULSD 100K miles is really the practical service life for optimal operation.

 

correct you are.................don,t know what i was thinking.... damn "senior moments" are becoming more prevalent.

 

Ha I can totally relate to that, it happens way more than I care to admit.

 

I must ask when you eliminated the dual tanks and the selector valve what did you do with the return line, if it didn't get re connected correctly or has any type of restriction it will affect the housing pressure in your injection pump and will make it do all kinds of weird things... just a thought

 

Another example of "should" replace injectors and pumps as units. The pump gets tired, doesnt build pressure as easy, nor as fast, but it works because the injectors pop earlier and easier as they wear. Now you have an old tired pump, popping new higher injectors, causing the actual injection event to happen later, aka, retarded timing. The adapter to do the timing correctly is semi-expensive, but worth the investment if you plan on keeping your IDI.

 

Thankyou all for your insight and suggestions.
After installing the new injectors , and this really bad white grey smoke , i decided to take it to an old friend who once had a diesel shop , he was reluctant , but after infirming him that he was the only one in 200 square miles that knew how to time one of these old fossils , he agreed to give it a go. My timing was way out, and yes somene had adjusted the timing to tun better with the old injectors . My friend retarded the timing as far as it would go to the passenger side. Truck runs like new . He also informed me i had a wierd looking pump on my truck, asked me where i got it. I took the engine out of a 89 f250 2wd auto, and threw it in my 90 f350 crewcsb 4x4, which i was told does'nt usually work out too good , becsuse the IP would be technically set way different .
i can drive it now as is , but thd pump prob wont last , i cant find a number in it , so i will have to find a cast number on the block and match it to a manual transmission pump for 1989 . Im thinking its gonna be a 1432 , but i want to be positive before i spen that kind of money .
thanks again for all the help , this website is like getting free love for the ancient Fords lol.

 

Wow that pump must have been way advanced to the point it was firing after TDC. The pump for your truck should be a DB2-4821 not sure where you came up with the 1421. Pics of the current pump might help identify it.

 

Here are two recommended suppliers for new IPs.

fuel injection injection pump injection pump rebuilding injection pump repair, Conestoga Diesel Injection Fuel Injection and Turbocharger Rebuilding. The Moose Pump people! Willow Street, PA Home

R&D IDI Performance - Home

The parts store IPs aren't very reliable because they aren't rebuilt the right way.

 

Russ on here, aka member "Typ4" also rebuilds these pumps. He has good prices and does a good job!
Along with the other two they are the "only" 3 reputable rebuilders around. Nobody makes them new, BTW.

Also if the pump was rotated to the passenger side, your buddy advanced it, he didnt retard it. Which sounds like that's what he did since all the white smoke. Glad you got her running like new!

 

Advanced timing means fuel injects *earlier* in the compression cycle. After TDC would be significantly retarded timing.