Simple VP44 Diagnosis - Get Power to the pump!

🔧 First step: watch us check multiple power failure points to your VP44. Hopefully it's an easy fix!
💪 Second step: check fuel to the VP44 with this easy tool:
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Chapters
0:00 Beginning
2:08 Tool needed to test electrical connections
3:49 Test fuses
4:26 "Key off" then disconnect VP44 wiring harness (pull slide lock out on one end)
5:02 Turn key back on, then test the wiring harness (which pins to test)
8:16 Another major problem: fuel system relay
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[@thoroughbreddiesel]

💪Need to check fuel to the VP44, use this easy tool: www.thoroughbreddiesel.com/3163834/ 🔥 Need a new VP44? www.thoroughbreddiesel.com/brands/vp44/

[@elvispusley3515]

I tested the space shuttle with a test light on the starter for the rockets, found a bad fuse and then jumped in and went to mars. It’s a great tool no doubt. Thank you.

[@outcastprojects6733]

Thank You Sir!!!!!!!!! A video that works!

[@thoroughbreddiesel]

You're welcome!

[@tylerayala9689]

I appreciate that little horn relay trick. Going on two years owning my stock vp truck and I’m loving it. I like to do my own maintenance too.

[@thoroughbreddiesel]

Glad to help!

[@ToddKing]

Actually a test light actually puts a bit of a load on the circuit so it can be more useful than a DVOM.

[@jimforsyth2.]

Test lights are a wonderful thing

[@danriceman7533]

Great info. Thanks Wade!

[@thoroughbreddiesel]

You bet! Thanks!

[@allennyikadzino3570]

Well explained. Thanks for the knowledge

[@thoroughbreddiesel]

You're welcome.

[@AcrossLeatherNewCastle]

Wade great video! Thank you for sharing. Now to check my 99 .

[@thoroughbreddiesel]

Thank you.

[@powellkwd40]

Very useful information. Thanks

[@thoroughbreddiesel]

You are welcome!

[@prodieselrepair3218]

I use test lights all the time. Yes voltmeters have their place, but nothing compares to using a test light to actually test whether the circuit can actually carry a load. You can measure proper voltage on a wire, but as soon as you put a load through the circuit, it can disappear if you have a bad wire. I used headlight bulbs a lot of times. I have several set up for different amps.

[@cyumadbrosummit3534]

What if you're only getting 10 volts on a test light? Partial/ low voltage is completely un-diagnosable with a test light. How is more information bad?

[@prodieselrepair3218]

@@cyumadbrosummit3534 No one said more info is bad.

[@4xprops457]

Grew up on test lights! . They are still awesome.!

[@thoroughbreddiesel]

Yes they are!

[@domcummins4148]

Test lights are extremely useful. Never had any issues with them. It's a basic tool that will help a lot!!

[@thoroughbreddiesel]

Totally agree!

[@domcummins4148]

@@thoroughbreddiesel By the way, thank you for all your amazing videos. They have been very helpful to me and my friends. God bless you all 🙏

[@thoroughbreddiesel]

You're welcome!

[@jimkillen1065]

Yea a test light is a good tool ..Appreciate the videos

[@thoroughbreddiesel]

Glad to hear!

[@johnnylindsey5808]

Good job

[@thoroughbreddiesel]

Thanks

[@de_fatherland6467]

Great video on basic diagnosis, hopefully I can find the problem on my Audi A6 2.5 TDI, haha completely different vehicles but same hpfp.

[@thoroughbreddiesel]

Good luck!

[@threemglobal]

Tq for sharing

[@thoroughbreddiesel]

Welcome 😊

[@court7803]

I love my test light.

[@ezisbell]

Have you checked for flames shooting under the hood LOL love it

[@thoroughbreddiesel]

😂

[@billycradic368]

I sure do like your bedroom and your knowledge. Gun man .

[@billycradic368]

Not bedroom lol your video

[@thoroughbreddiesel]

😂😂😂

[@flatv1715]

In Orlando, we need a "Thoroughbred Diesel shop"🤣🤣🤣🤣

[@thoroughbreddiesel]

We ship to Orlando 😉

[@flatv1715]

Yes I know,,I buy vP44 one month ago 😆,, the only thing is I don't trust in the Tech here Lol

[@pytbob]

Wait til you guys learn about Power Probes, like a test light for this millennium ;)

[@robtaylor6806]

I’ve been using them for over 25 years. I have 4 of them. Use one everyday.

[@davekana8388]

Hi Wade, most helpful, hard start warm or hot. I guess I need to get a test light. Did you make a video on checking for ground, 2000 VP44 truck, thanks.

[@thoroughbreddiesel]

Thanks! Not yet.

[@davekana8388]

@@thoroughbreddiesel please do, use Wades truck, thanks. Bet he likes getting paid for working on his on vehicle!🤓

[@6okokokokokok6]

Have one that will start but sounds like its only running on 2-3 cylinders and has no throttle pedal. Everything i see online says thats a guaranteed bad vp44. Could wiring or 12v to the vp44 cause this as well or is that guaranteed bad vp44 right?

[@user-nc4zw8zs9r]

Wade, I have tested everything exactly as said in video including battery voltage on this 99' I've got in the shop and it turns over great but still wont start. Do the VP44 models "hummm" like the common rails do as you stated as a good lift pump test in a previous video I watched. Any help would be greatly appreciated and thanks for the detailed videos and advice!

[@thoroughbreddiesel]

No humming, but with the truck you are working on, if it’s a 99 and wont start but has good LP pressure and voltage to the pump, check to see if you have any crank signal (tach). A bad crank position sensor will keep the 98-200 trucks from starting.

[@here_to_watch2115]

What could cause the fuel psi to fluctuate from 16 down to 6 while on the throttle at various % of throttle. Never goes below that but it was always steady between 12 and 15 prior. It has a new fuel filter since this started and I'd like to also note has raptor 150 on it.

[@thoroughbreddiesel]

Verify this with a second gauge to get repeatability in your data.

[@here_to_watch2115]

@@thoroughbreddiesel I actually called the company that makes the raptor lift pump (I have the rp150) and they guy told me about the oe lift pump Deutsch connector being notorious for failing. I cleaned the contacts and she's bad to normal. Thanks for responding!

[@littlewhiteranger]

So if I DO have both power and ground to #6 & #7 pins and my truck still doesn't start them something bad happened to my VP44? My truck ran fine before I pulled the engine to be re-sealed and had the head built but now that I finally got it back together it won't start and I can't find videos showing "how" fuel should be coming out of the injector lines to bleed

[@thoroughbreddiesel]

If you don’t have correct lift pump pressure the truck still won't run.

[@chrisspangler6740]

will you swap a common rail fuel system to a vp44 motor with pop off injectors.make it cp3 common rail system with electric injectors.modify the injectors or make a hybrid set-up.use a gen 2 24 valve engine.

[@thoroughbreddiesel]

This gets brought up a lot but I don’t see any value to it. IF you want common rail easier and cheaper to stay common rail. Using mechanical injectors cant happen, you have to have computer controlled timing.

[@user-tl4dv5qj3k]

Got a p1689 code , p0230 and p1693. Checked fuel pressure on lift pump and got nothing. Replaced lift pump and that cleared all codes but p1689. Starts and idles ok after lift pump replaced but won’t get over 1500rpms and only goes ~25mph. After checking all the power , if everything is good would this be a symptom of a bad vp44?

[@thoroughbreddiesel]

Could be, or check the main connector at the VP44 connector for connection. Also check harness well.

[@user-uh8tp7du3t]

So I just recently just go a Qaudzilla adrenaline for my 02 dodge and I got everything set up and followed all the directions so I was ready to start it so I went and started it and it started rough idleing really really bad and was spitting out white smoke really bad that burns your eyes I have no idea what it could be if you could help me out it would be much appreciated

[@thoroughbreddiesel]

If you put the fuel pressure sensor in, it could be working through some air. Recheck all of your connections. Possible you cut the wrong wire on the vp as well.

[@edskitv8736]

will the vp44 start the engine and idle without fuel pressure or does it need fuel pressure to start?

[@thoroughbreddiesel]

Needs fuel flow to start.

[@bassemrezgui1704]

Pls i have ford fiesta 1.8 tddi 2000 no throtlle and wierd sound in the pump and preheating light flashing pls help

[@thoroughbreddiesel]

I am not familiar with operation system on this car, but I would scan the codes first and diagnose based on that.

[@JustinHill8elsiervo]

Hi getting battery voltage to power and ground. The truck wont start. I cracked the lines at the head and it spits fuel. I replaced the lift pump also just in case. What else would cause issues with fuel delivery? I checked with starting fluid as a quick check and the truck starts immediately.

[@thoroughbreddiesel]

If the truck will start on ether then you are either having a lift pump issue or the truck isnt cranking fast enough. Look to replace batteries and move forward.

[@derekis1joedirt]

@@thoroughbreddiesel I don't think that Justin Hill ment that it starts and stays running after starting on starting fluid.

[@blawsonbl]

What about a manual truck that I can roll start but not start with the starter? Turns over great. Just won't start.

[@thoroughbreddiesel]

Check lift pump pressure and pull codes.

[@charleydaniels6563]

So I'm swapping the 24v Cummins with it's vp44 in to a 87 Chevy truck question with the vp run the engine with out the CPU

[@thoroughbreddiesel]

Will need a ECM for sure.

[@charleydaniels6563]

@@thoroughbreddiesel ok can I swap out the vp44 for a ve pump and make it run

[@garymarek8250]

I still can’t get power to pin 7. I have a 2000 Dodge 5.9 Cummins. I did everything you said in the video, no luck. Any other suggestions?

[@garymarek8250]

When I pull the 20amp engine control fuse, I get a lot of buzzing noises.

[@thoroughbreddiesel]

Would suspect ECM at that point.

[@jamesgoodwinwandagoodwinja5235]

Can someone tell how the firing order lays out on the rear of vp-44 where injector lines connect thanks for any help

[@jamesgoodwinwandagoodwinja5235]

I want to make sure that I haven't crossed some up connecting to pump when I recently replaced pump and was in a big hurry and forgot to mark line on pump side,

[@thoroughbreddiesel]

Give us a call and we can send you a diagram.

[@cjedl]

If you’re getting power to the vp44, does that mean everything up to that point is working correctly? Like the ecm? I replaced the vp44 with a thoroughbred pump. I bled the lines, checked lift pump pressure and it reads 21 psi. Not firing up at all. Not sure what to do at this point. Don’t wanna throw more parts at it without a better idea

[@thoroughbreddiesel]

We will be able to help you diagnose better if you give us a call, 859 737 4966, but lets review this for others that are reading it. So you have power and ground to the VP, you have good LP pressure. The next thing to diagnose would be to see what codes are in the truck. Clear them and then see what comes back when you crank the next time. Is the truck cranking over at the proper speed? If it’s a 98-99 truck, are you seeing tach movement? If not, suspect the crank position sensor.

[@cjedl]

@@thoroughbreddiesel thanks for responding. Here’s an update. Finally got it to fire but it’s running rough and white smoking pretty bad. I tried to start it the next day and it wouldn’t fire. Running rough and white smoking is what it was doing before the vp44 install so I most likely misdiagnosed the problem. It is an 01. I’ll check the codes tonight.

[@cjedl]

Had a P1689 code. I cleared it and no codes have popped up after cranking. Hasn’t fired up since. Has no crank position sensor

[@cjedl]

Starter crapped out. I replaced it and the truck started right up. The truck runs bad and smokes like a freight train.

[@ThatBurgundy_24Valve]

My truck just died going down the road and now will crank but no start. There is power to the pump and i checked the fuses and all is good. My guess is vp is bad.

[@thoroughbreddiesel]

You would want to check lift pump pressure and check codes before jumping off the deep end and condemning pump.

[@ThatBurgundy_24Valve]

@thoroughbreddiesel I tried to hot wire the pump as well and no dice.

[@xxxbadapple]

I'm in the process of checking the obvious things but has anyone had a problem with a 1999 or similar gen running great then all the sudden won't start and run? I checked for codes and have 0 codes. It cranks normally and will start but when it does start it run awful like it had a giant cam in it.. then dies a few seconds later. Rinse and repeat. Initially the first time it did it I was able to crank it a couple times and it started and ran fine.. now it won't start and run continuously at all. No pedal either.. I can't help but think its not the VP44 but possibly the PCM / ECM? I've had the WTS issue for a while now. Open to suggestions.

[@thoroughbreddiesel]

WTS issue as you have to wait for the light to come on before it will start? That’s ECM for sure. I suggest checking tach signal (bad crank sensor) and checking lift pump pressure.

[@xxxbadapple]

@@thoroughbreddiesel the lift pump is working fine. I'll have to check the crank sensor. Thanks

[@supremeautomotive6749]

I have a sid 254 fmi 8 code

[@thoroughbreddiesel]

You have the p0254 code? That will be fuel valve feedback, suspect the pump to be bad.

[@supremeautomotive6749]

I have this motor in my RV and it starts and runs and drives but has little to no power. Power comes and goes. At 2300 it picks up a little but anything under 2300 rpm power falls out.

[@thoroughbreddiesel]

Need to check codes and lift pump pressure.

[@supremeautomotive6749]

@@thoroughbreddiesel sid 254 fmi 8 is the code

[@supremeautomotive6749]

@@thoroughbreddiesel it runs and drives its weird. Had new lift pump put in but could be not good. How can I check the pressure. I do have laptop to read codes but don't see fuel pressure reading

[@andrewstrauss6341]

@@supremeautomotive6749 was it the vp44 that failed?? I currently have the same code and the truck starts and idles great. But lacks power. Please let me know!

[@edwardtorres8412]

What if all relays and fuses are good but still not getting power to the vp44?

[@thoroughbreddiesel]

Suspect ECM or wiring.

[@tutehernandez3233]

What ECM?

[@535459]

5 minutes later........ do we have power to the vp44?

[@thoroughbreddiesel]

It’s verbatim the title to the video.

[@jameswinchel1833]

I had a code p1688

[@thoroughbreddiesel]

You'll need to bring it to your local mechanic.

[@jameswinchel1833]

@@thoroughbreddiesel got a new pump should be here tomorrow

[@rayocaballo6122]

One more great video from you

[@thoroughbreddiesel]

Thank you!