Engine/Transmission (1998.5 - 2002) lift pump revision history

[Texas Diesel]

Some one here posted the various lift pump #'s and the changes made with each revision. I printed it out and gave to the mechanic but now I cant find the thread again, anyone have it?



TIA

 

[Texas Diesel]

TTT

 

[SteveE]

Lift pump #'s

Here is what I have on file.



Lift pumps

lift pumps and what changes were done to them and part Numbers. hope this helps

this is long. dont ask were it came from and i will not have to lie



CORRECTIVE ACTION SUMMARY



Below is a breif history of Lift Pump Part Number and associated

design/product changes:



12V 24V



3943467 3942802 Initial ISB Production



3944818 3942802 Added "saw cut" to the motor casing to better

detect leaks during production



3944508 Stainless Steel Valve Seat/Bronze Bushing for

the Internal Pressure Regulator



3945812 3945813 Some lift pumps were having a problem with

the internal wiring shorting to the magnet sleeve. The wiring

insulation was inadvertantly being

stripped from the wiring during assembly and during pump operation the

wires are shorting to the magnet sleeve.

Federal Mogul has changed the angularity of the wire lugs in the bottom

of the pump so the wires will enter behind the

magnet sleeve in a more direct manner, thereby reducing the chances of

stripping

the insulation. They also changed their end

of the line testing to look for this shorting problem during pump

operation. Federal Mogul is also adding a

radius to the top and the bottom of the magnet sleeve where the wires

travel behind the sleeve.



3948431 3948432 Corrosion of the connection of the pig tail

at the bottom of the pump was being seen. This was found to be to the

result of road salt acting as an electrolyte.

The electrical eye terminal was changed by the vendor from brass to

bronze. No corrosion is evident during similation

and salt fog tests with the bronze terminal. The mechanical properties

of the bronze meet or exceed that of the

brass and the vendor did conduct vibration test for further

verification. To further aid in corrosion

resistance, grease was added to each terminal at the Engine plant during

assembly.



3946151 3948070 The lift pump was updated with an

integral electrical connector. The integrated connector eliminates the

need for a pigtail type harness on the pump

and will eliminate the exposure of the pigtail to environmental elements.

Also updated was EMI reduction for the pump

due to an added capacitor to the internal circuit board and a Ferride bead

added to the connector.



3948431 (12V) and 3948432 (24V) where still

kept available for service because the wiring harness on older engines

where not long enough to plug into the integral adapter.



3938367 3938368 It was found the bearing material used

for the MFR. of bearings was not consistently uniform,leading to

variance in the pump performance. This

leads to change the bearing material to sintered iron from bronze.

There was also a change in armature shaft

geometry to straight one reduces the 100% inspection of the shafts.

These pumps have the integral connector.



For service, 3948431 (12V) was superceded to

3938435 (12V) and 3948434 (24V) was superceded to 3938436 (24V).

These pumps still maintain the pigtail wiring harness.



3990082 This is a service kit supercedes

3948431(12V). It includes 3938367 (12V) and a jumper harness (4025182) so

that it can be used on older engines with the

shorter lift pump connection wiring harness. 3938436 (24V) was superceded

to 3938368 (24V), but a kit was not created to

included the jumper harness, 4025182 must be ordered separately.







3990105 3990106 The lift pumps have been updated to include

hardened valve seat to reduce valve wear. The pump also reverts to a

prior use RFI circuit board due tocomponents being

detached and jamming the pump.



Service kit 3990082 was updated to include

3990105 (12V). 3938368 (24V) was superceded to 3990106 (24V), but a kit

was not created to included the jumper harness,

4025182 must be ordered separately.





III. IMPLEMENTATION SUMMARY

The supplier started building pumps with these corrective actions in the

first week of May 2001. The latest lift pumps, part number 3990105 and

3990106 when into production

Steve

 

[B9Mile]

Its here in this thread.



https://www.turbodieselregister.com/forums/showthread.php?threadid=39630

 

[B9Mile]

OOOPS! Wrong thread. Here it is.



https://www.turbodieselregister.com/forums/showthread.php?threadid=39791

 

[Texas Diesel]

Thanks!

 

[Old Man]

correct pump number

Today (17th) I just replaced my old lift pump with #3990105. After reading above, I'm a little confused regarding the pump numbers pretaining to the 12v and 24v. I have a 01 24v. Is the pump I put on (#3990105) the correct pump for the 24v. I bought the pump at cummins. Thanks. Old Man

 

[Steve St.Laurent]

The 12v and 24v that is listed is 12 or 24 volts, not 12 or 24 valves. The 12 valve trucks use a mechanical pump, not an electric one.

 

[Big White Beast]

Just put mine in.........

I got it this week and the part # for the latest is 3990105. Manufacture date is June 02. I imagine there aren't many old ones sitting on a shelf.



Garrett

 

[Old Man]

How long has it been

Steve St. , How long has it been now since you went to the lift/pusher pump combo and have had no problems. I think I'm going that route. After re-reading the above thread several times, I finally realized it was volts and not valves. I guess I need to hire me a proof reader. My mind is going, now what else. Later.

 

[Steve St.Laurent]

13 months and 45,000 miles

 

[Old Man]

Thanks!

Steve, thanks for the response. My truck is a 2001. 5 ETH/DEE with only 16,759 mi. At idle the FP would drop to 9 psi. Pressure was the same using the gauge in the truck (autometer) and B. Hoppers. New fuel pump (#3990105) doesn't seem as strong as my old one. I can draw my fuel pressure down to 8 psi much easier than I could with my old one. I will be going to your setup. Thanks again for your response. Later... ... O. M.