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Lift pump

Old 12-27-2018, 08:00 AM
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Lift pump

This may have been talked about but gonna ask again, looking for a different lif pump for my ole 93 which is pretty well stock other than a fuel pin it currently still working but wanna replace before I have to replace it at a inconvient time, would be better to go with a piston type?
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Old 12-27-2018, 08:03 AM
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Get a HVLP lift pump.
Yes it is an upgrade worth doing.
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Old 12-27-2018, 08:06 AM
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can you get those hvlp direct from cummins or do the have to be detuned for pressure so you don't hurt injection pump?
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Old 12-27-2018, 08:14 AM
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I order the proper LOW pressure piston pump along with the few parts needed to install it from The Hungry Diesel myself.
If you order it from Cummins you have to be sure you don't get a P-pumped LP that runs a much higher fuel pressure and will damage you injection pump.
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Old 12-27-2018, 08:17 AM
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the reason I ask is because I work for cummins up in Canada and can get a great deal on parts but my parts people are sub par and unless it is under the serial number it dosent exist in their world
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Old 12-27-2018, 08:21 AM
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Do some research on getting the right # for them then.
There are dozens of threads on here with the right part #.
I don't remember it off the top of my head.
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Old 12-27-2018, 12:25 PM
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From the sticky, I found these numbers. Called cummins and quoted pricing for me.
Called cummins to price all the parts to swap over to the HVLP pump.

Here's what they said:

(2) 3918191 seals (new number 3963983) $2.45 each
(1) 3914753 Fuel tube $ 42.56
(1) 3936320 Fuel pump (new number 4988751) $116.53
(2) 3931348 gaskets $4.47 each
(1) 3914284 spacer $16.62


Total for all parts $ 189.55 plus tax

I'll be ordering mine after the new year
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Old 12-27-2018, 02:17 PM
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Under NO circumstances should you put a piston pump on your VE injection pump truck unless the seller guarantees the pressure is OK for the VE. You can test the pressure of a piston pump by attaching a fuel pressure gauge to the output port and dipping the input into a jar of fuel. The pump should be primed with fuel BTW. Then press the pushrod a few times, NOT the priming button, until the reading on the gauge stabilizes. This will be the maximum pressure you can get out of that pump.

My pump from Nascar Mark was set at 15 psi IIRC.

I used a pump I bought off Amazon which put out over 35 psi and it popped the front seal out of my VE injection pump and filled the crankcase with about 5 gallons of fuel while I was going down the 91 freeway in Corona CA. Had to be towed home and do a whole bunch or work to get that straightened out.

Edwin
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Old 12-27-2018, 06:12 PM
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Originally Posted by edwinsmith View Post
Under NO circumstances should you put a piston pump on your VE injection pump truck unless the seller guarantees the pressure is OK for the VE. You can test the pressure of a piston pump by attaching a fuel pressure gauge to the output port and dipping the input into a jar of fuel. The pump should be primed with fuel BTW. Then press the pushrod a few times, NOT the priming button, until the reading on the gauge stabilizes. This will be the maximum pressure you can get out of that pump.

My pump from Nascar Mark was set at 15 psi IIRC.

I used a pump I bought off Amazon which put out over 35 psi and it popped the front seal out of my VE injection pump and filled the crankcase with about 5 gallons of fuel while I was going down the 91 freeway in Corona CA. Had to be towed home and do a whole bunch or work to get that straightened out.

Edwin
I remember that, which is specifically why I was inquiring.

I'd I go that route, I'll be testing the unit no matter whom I purchase it from.

Thank you, sir.

Starter is,complete. I'm here for you, when the time comes.


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Old 12-27-2018, 07:17 PM
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There you go, the #s where in the sticky all along and now T-man has typed them down for you.
Your sub par Cummins parts guys should be able to work with that.
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Old 12-27-2018, 08:02 PM
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Originally Posted by NJTman View Post

Starter is,complete. I'm here for you, when the time comes.
I just got my brush set in the mail so I'm ready to start except I caught a bad head cold somewhere. From the sticky thread I don't anticipate any problems other than a twisted off copper stud. I have laid in a good supply of WD-40 for that. Thanks for your kind offer of help.

Edwin
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Old 12-28-2018, 08:03 AM
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Thanks for the replys those are good parts numbers will be ordering that stuff today, looks like should be able to get everything for about 140 Canadian so a cheap upgrade
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Old 12-28-2018, 02:35 PM
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Originally Posted by Sasker View Post
Thanks for the replys those are good parts numbers will be ordering that stuff today, looks like should be able to get everything for about 140 Canadian so a cheap upgrade
I bought my HVLP from somebody on Amazon that supposedly matched the part number listed in the sticky. I'm to lazy to look it up but my point is the pump I got had too much pressure. I think the vendor figured as long as the pressure was above spec for the part number it would replace that part number.

Again, I urge you to "trust but verify" the pressure of your new pump if you have a VE injection pump. Otherwise your oil could be way overfull and smell like diesel.

Edwin
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Old 12-29-2018, 12:03 PM
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So you know, your getting some bad info here. 3936320 Fuel pump (new number 4988751) is NOT a HVLP pump.
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Old 12-29-2018, 12:13 PM
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Originally Posted by nascar mark View Post
So you know, your getting some bad info here. 3936320 Fuel pump (new number 4988751) is NOT a HVLP pump.
Well, if that's indeed true, someone better change the sticky, because Thats where the numbers come from

https://www.dieseltruckresource.com/...22/#post915409

Then the pump number changed in 2007 to this

https://www.dieseltruckresource.com/...3/#post1471359

Then the pump number changed again in 2008 to the 4988751

https://www.dieseltruckresource.com/...3/#post2236558

Then BC updated the information here for guys who are running big power, vs a stocker replacement to the piston lift pump:

https://www.dieseltruckresource.com/...t-pump-176472/


Lots of as you say "bad info" that probably a couple hundred guys have done before, and none of them care to update it ?


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