In tank fuel pump not working (new)

[Turbowski]

Hello all. I have a 2001 24v and I replaced my lift pump and the in tank pump recently. The issue I'm having is the in tank pump isnt turning on. I can hear the lift pump. But not the in tank pump. This would be the 3rd one I tried from oreillys. I already checked the relays and fuses and I'm having no luck.

 

[KATOOM]

Sorry but this doesnt make sense unless someone did some incorrect alterations to your truck. Because you should only have one lift pump (fuel pump), not two. If its stock then there's either one mounted to the engine, or if the dealer did the "upgrade" then the one on the engine will be removed and replaced with one in the fuel module in the tank.

 

[Turbowski]

See that's what I thought. But when I pull up fuel pumps for this 5.9 it comes up with the in tank. And the one on the block.

 

[Turbowski]

This is the pump in the tank

 

[KATOOM]

Thats a picture of the top of the fuel module, and you cant tell if there's a fuel pump in there just by looking at it. What you have to look for is if there's a fuel pump mounted to the drivers side rear of the engine block. If you cant tell where that fuel pump is supposed to be located, you can either internet search for a picture of where to find it or climb under the truck and follow the fuel lines up to the engine and see if it connects to an obvious fuel pump. If you discover that there is no fuel pump on the engine block then there has to be one in the tank module.

 

[Turbowski]

Thats a picture of the top of the fuel module, and you cant tell if there's a fuel pump in there just by looking at it. What you have to look for is if there's a fuel pump mounted to the drivers side rear of the engine block. If you cant tell where that fuel pump is supposed to be located, you can either internet search for a picture of where to find it or climb under the truck and follow the fuel lines up to the engine and see if it connects to an obvious fuel pump. If you discover that there is no fuel pump on the engine block then there has to be one in the tank module.

I changed the pump that's on the side of the block the same time I changed the one pictured. When I bump the starter the one on the block is running. I tried bleeding my injectors and I'm only getting bubbles out of #4. I don't have a fuel psi gauge. But the lift pump on the block is pulling cause I can hear it. So is the one in the tank just labeled as a fuel pump but not a pump at all. Thank you.

 

[DavidC]

Did the original you pulled out have a pump in it ?. Geno's is the only place I have heard of that sells the original no pump tank sump. Seems everyone else sells the sump that has the pump and will only work if the wiring has been modified and a relay added. The pump on the block is usually removed during this.

 

[KATOOM]

Ok.....let me try to explain it better.

There is a electrical plug connector coming from the ECM which supplies power to one fuel pump. This connector is only capable of connecting to one fuel pump at a time, and the ECM isnt designed to handle the amperage load of two fuel pumps. There is no way to connect two fuel pumps to the ECM power unless you've spliced another connector for the in-tank fuel pump.

That said, there are people who've tried to install two aftermarket fuel pumps in series and its a terrible way to try supply fuel to the engine. Two pumps fight each other and if one fails then the other is pushing through or sucking through.

So again, there is only ONE fuel pump unless you unknowingly installed a fuel module (what you have a picture of) with an in-tank fuel pump inside. Note - The fuel module that comes with the engine mounted fuel pump does not have a fuel pump inside.

 

[JR]

If you actually put both pumps on as you say, the problem may be right there. There can only be power to one of the lift pumps provided the CORRECT factory wiring is used and the non functional in tank pump is likely acting as a restriction and not allowing the block mounted pump to pull adequate fuel through it. Do you have a picture or receipt of what you installed?

You also should have a fuel pressure gauge....they are invaluable for protecting the VP44 as well as troubleshooting problems like this.

 

[Turbowski]

If you actually put both pumps on as you say, the problem may be right there. There can only be power to one of the lift pumps provided the CORRECT factory wiring is used and the non functional in tank pump is likely acting as a restriction and not allowing the block mounted pump to pull adequate fuel through it. Do you have a picture or receipt of what you installed?

You also should have a fuel pressure gauge....they are invaluable for protecting the VP44 as well as troubleshooting problems like this.

I installed a precision fuel pump that was at O'Reilly's. It's the first one that pulls up when you look up fuel pump.
What part# am I supposed to be putting in that tank if this precision isnt the correct one?

 

[JR]

As has been articulated above, the point is you are not supposed to have two lift pumps. Either a block mounted lift pump OR an in tank pump with the appropriate wiring harness and relays. Your truck came from the factory with the block mounted pump but after experiencing such a high failure rate Dodge came up with a retro fit that eliminated the block mounted pump in favor of the in tank pump and a wiring harness that plugs into the original block mounted harness. It is not physically possible to run both pumps off the factory wiring without hacking the harness up.

One or the other, not both.

 

[JR]

Is this what you installed?


https://www.oreillyauto.com/detail/...mbly/a30060/4614935/2001/dodge/ram-2500?pos=2

 

[Turbowski]

Is this what you installed?


https://www.oreillyauto.com/detail/...mbly/a30060/4614935/2001/dodge/ram-2500?pos=2

Yes it is

 

[JR]

Gotta run but What was the original problem you had to decide to change this out? Does your old sending unit you pulled have a pump or just the sending unit?

 

[Turbowski]

Gotta run but What was the original problem you had to decide to change this out? Does your old sending unit you pulled have a pump or just the sending unit?

I had water in fuel pop up on my dash. So I shut the truck down. When i drained the filter housing i noticed a lot of sand and sentiment in the bottom. I cleaned that out and filled the housing with clean diesel. When I bumped the starter I noticed that the lift pump wasnt running so I checked the tank cause I thought there was one there also and there wasnt any sound. So I looked up on oreillys and got both thinking that's what I needed. But now nothing is bleeding right and I'm about at my limit before I lose it lol

 

[JR]

If it was running before the pump is likely fine. To properly bleed the pump can take several cycles of bumping (not cranking) the starter, you also have to crack the fuel line loose at the inlet of the VP44 to give the air somewhere to go. You don't want to be cranking the engine at this point, turn the ignition to on and bump the starter just enough to activate the lift pump. It will run for about 20 seconds, turn key off and repeat until no air is coming from the loose fuel line at the inlet of the VP. Once you accomplish this the line will need tightened and then you will have to bleed the air out of the injectors.

The wildcard here is if the block mounted pump will pull through the in tank pump. You should decide which one you want to use and eliminate the other.

 

[Ozymandias]

Yes it is

That is the fuel sending/pump unit that is meant for vehicles that already have been converted to the in-tank pump, a replacement.
Apparently you still have the block mounted old pump also installed - you need now the missing conversion parts to get rid of that old pump.

Otherwise your truck never will run properly an we run in circles here telling you that 2 pumps together won't work.


...or you get rid of that brand new fuel pump sending unit and install instead the old unit back that is only a suction cup.
But that would be a step backwards in every aspect.

 

[Ozymandias]

The wildcard here is if the block mounted pump will pull through the in tank pump.

Nope, won't work, tried my self.

 

[Turbowski]

Well I think my wife threw out the old sending unit when she was going through the garage door big trash day. Do any of yall have a part # for another sending unit?

 

[Ozymandias]

There you are

https://www.genosgarage.com/product/mopar-fuel-tank-module-sending-unit-4897668/fuel-tank-components

Thats the unit without pump.