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Topic: Lift Pump- Please ID Wiring And Device (Read 580 times) previous topic - next topic

Lift Pump- Please ID Wiring And Device

This is the existing lift pump I will be changing out as soon as I can get a new one delivered.  (Please see attached photos)

Can anyone tell me about the wiring connector shown at the top of the bracket?  I have not been able to find any info about this. 

2001 ISC 350hp.

Thank you.

-FT
2001 U270- 34'
with Aqua-hot
Travel Safely
Have Fun!!

Re: Lift Pump- Please ID Wiring And Device

Reply #1 –
It's just a standard wiring connector. Just pull the tap outward a little and pull the plug out.
Peter and Frieda Morin
1999 36ft. U320 Foretravel
Build # 5436
1998 Suzuki Sidekick Sport

Re: Lift Pump- Please ID Wiring And Device

Reply #2 –
Thanks for the reply.

I understand how to disconnect.  Do you know what the connector serves?  Pump is powered at the bottom of the pump correct?

-FT
2001 U270- 34'
with Aqua-hot
Travel Safely
Have Fun!!

Re: Lift Pump- Please ID Wiring And Device

Reply #3 –
FT,

Can you follow the wire from the plug?  Probably not - usually just disappears into a big wiring loom.

Have you looked online for documentation that accompanies a replacement pump?  Sometimes the paperwork ID's wiring connections.

I'm just armchair guessing here - might be the connector for some kind of fuel pressure sensing device...sends info to engine CPU?

Are you signed up at Cummins QuickServe Online?  Only requires your engine serial number (ESN) to sign up for free.  Lots of good info available for your specific engine, including detailed parts breakdown diagrams for every system, including "Fuel Delivery".

Cummins QuickServe Online
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Lift Pump- Please ID Wiring And Device

Reply #4 –
Greetings Chuck.

I was just discussing with my wife that I probably have to drive the 20 minutes again to trace it out.  I have looked at the Cummins resource.  I have not seen this anywhere.

In thinking about this, is it possible it may be a heating element installed after-market?  I believe the previous owner went up north quite a bit. 

Obviously I am not a mechanic but believe some of the upgraded fuel system companies offer various options for keeping fuel warm in cold climates.  I do not even know if a heating element installed to the bracket which would transfer heat to the pump assembly is even a thing.  Just thinking out loud. (in writing)

Thanks again Chuck.

-FT
2001 U270- 34'
with Aqua-hot
Travel Safely
Have Fun!!

Re: Lift Pump- Please ID Wiring And Device

Reply #5 –
It sure looks like it is oem to me. I googled fuel heaters and they are put in the fuel line. Until now I never even knew there was
such a thing.
Peter and Frieda Morin
1999 36ft. U320 Foretravel
Build # 5436
1998 Suzuki Sidekick Sport

Re: Lift Pump- Please ID Wiring And Device

Reply #6 –
Just thinking out loud.

Remember when they are available next year- I thought of it!! 
2001 U270- 34'
with Aqua-hot
Travel Safely
Have Fun!!

Re: Lift Pump- Please ID Wiring And Device

Reply #7 –
Quote from: FtRoadTrip –
In thinking about this, is it possible it may be a heating element installed after-market?
Bear in mind that I have a pure mechanical C8.3 and therefore little knowledge of the electronically controlled engines.

IMO, from your photo the wiring connection in question looks OEM, not added on.

Keeping diesel engine fuel "warm" is usually not a problem, even in cold weather.  Feel the side of your fuel tank after a highway drive.  A heating element at the lift pump would be of little value.  If the fuel can make it successfully from the tank to the lift pump, then it is flowing freely.  Using the correct fuel blend would have a much greater bearing on cold weather operation.
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Lift Pump- Please ID Wiring And Device

Reply #8 –
If you needa part number forlift pump I had mine replaced a few tears ago and Dave Metzger sold me one and I have invoice. It will be same as yours for sure as mine is a 2000 with 8.3 350 Isc.
Let me know if you want it.
JohnH
Coachless, now use aircraft. 2003 Ford Travelair TC280 class C. Super shape. Just for 1 yr .
1994 Ford E350 ClassC,total renovation inside and out. Now sold.
2000 U295  36' Cummins 350 c/w Banks Stinger, Resonator upgrade,Solar, LED lites.Residential fridge with slide out pantry. Build 5674. Sold
ex 92 GV 022C ored Cummins. Sold
ex 95 GV240 cat 3116. Sold
2017 Mini cooper s & 2016 land Rover LR2 HSE  LUX.
jhaygarth@aol.com    SKP #130098
treat everyone as you would like to be.

Re: Lift Pump- Please ID Wiring And Device

Reply #9 –
Thank you John.

I do have the part number. 

I was looking at it's paperwork and comparing it to what is installed.  During my comparison I found my unknown part installed on the mounting bracket. 

I have spoken to the factory, sent them the picture, and so far it is still unknown.

I am going to try tracing the wire.  Maybe using a tone generator. 

I always appreciate the help.

-FT
2001 U270- 34'
with Aqua-hot
Travel Safely
Have Fun!!

Re: Lift Pump- Please ID Wiring And Device

Reply #10 –
While not familiar with this particular pump/engine, many newer lift pumps also monitor oil pressure and have a timing circuit. This allows you to have pump operation at "key on" for a predetermined period then it shuts off and only comes back on when it senses minimal (usually 5-ish psi) oil pressure...that way if you loose oil pressure for any reason your pump will shut off..
Len Barron
1988 GV36 U280 3208T(250hp)/MT643
1972 Jeep Commando LS2/4L65e
2000 Chevy Express Hightop Campervan
LBZ Duramax /6sp Allison

Re: Lift Pump- Please ID Wiring And Device

Reply #11 –
Thanks Len.

My engine utilizes the dreaded CAPS injection system.  The lift pump I am replacing is notorious for leaks. 

My understanding is that when operating properly it only runs for the first thirty seconds of the key being put into the accessory position.  It serves to build fuel pressure from the tank until the second mechanical pump which serves the CAPS system takes over during engine operation.

I did verify that it still runs and builds pressure.  Apparently the assembly gasket fails routinely and even more rapidly when exposed to bio-diesel, etc.  I have read that the replacement pumps are able to better deal with the fuel situation.  I am not sure if that has been proven to be true. 

I have read that for a possible short term solution that checking the torque on the three cap screws which fasten the pump assembly to the manifold is worth a try.  Care must be taken not to overtighten.  I gave that a try but I still had the leak.

I did have my coach serviced at a Cummins Care facility before my last excursion.  I asked them to give the engine a check for any ongoing problems.  They found an exhaust leak and changed the manifold.  No mention of a fuel leak.  I am going to assume this is a new problem which I was able to find early- wouldn't that be great.  The only reason I found it was spending time researching this forum for important issues which may arise.  We Foretravel owners are fortunate to have this great resource.

Thanks for your reply.

-FT
2001 U270- 34'
with Aqua-hot
Travel Safely
Have Fun!!
 

Re: Lift Pump- Please ID Wiring And Device

Reply #12 –
Solved.

I was able to get out the coach today.  I removed the item from the lift pump bracket, cleaned it up and found part #3085140.

According to Cummins this is a pressure sensor. 

Cummins has retired this sensor, and then retired the replacement.  I was given part #4359572 as the current solution should my existing sensor fail.  #4359572 does not mount to the bracket.  If an upgrade needs to be done I will need to purchase jumper harness #4384743 to connect to the existing wiring.

Thanks to everyone for their help.

On to the next one!!

-FT
2001 U270- 34'
with Aqua-hot
Travel Safely
Have Fun!!