Fuel Pump Questions

[llotton]

I have an 03 with the original pump on the filter housing:

Questions:

1. Is the "original" pump a "flow through" type? In other words when or if the original pump fails and is replaced with an in tank is the failed pump retained in the stock position and simply pumped through?

2. After the intank pump is installed if it fails can fuel be pulled through it by an original style pump in case it fails while on the road?

I have reviewed the "replacement" proceedure on the original pump at the fuel filter housing and have considered having a spare on board in case the OEM pump fails. And if the intank pump failed on the road could I use the original style to "limp" in on?

Thank you for your inmput. Larry

 

[Gypsyman]

The original filter mounted pump is a positive seal design and you won't push much if any fuel thru it from what I've seen and tested on the bench. When the in-tank conversion is done the filter mounted pump is replaced with a banjo type adapter supplied by Dodge.



The in-tank pump is the same way (I have one gutted on the bench right now).



Richard

 

[JRG]

Could someone run both? Would that have any performance value?



JRG

 

[Gypsyman]

I've seen people do it but your still counting on the in-tank pump staying alive.

 

[cyborg]

The original filter mounted pump is a positive seal design and you won't push much if any fuel thru it from what I've seen and tested on the bench. When the in-tank conversion is done the filter mounted pump is replaced with a banjo type adapter supplied by Dodge.



The in-tank pump is the same way (I have one gutted on the bench right now).



Richard

I've been curious as to what they actually install in the tank. Is it the type that the pump can be easily eliminated and replaced with a pick-up tube?

 

[llotton]

Thanks for the response guys. The reason I was asking was I was trying to decide weather to buy a stock replacement pump to have on board incase of a failure. If the stock or OEM pump fails and is replaced with the in tank unit and that later failed I wondered if an OEM type could be used in an emergency and pull through the intank pump. If not then I won't waste the money on a spare OEM style pump.

 

[MFalkinham]

I replaced my OEM style pump with a Walbro GSL-392 and never looked back. There was nothing wrong with my OEM pump, but I didn't trust it and knew that it would only be a matter of time before it stranded me somewhere. I definitely didn't want the in-tank Dodge "solution".

I was able to sell my OEM lift pump to another guy with an '03 who wanted to have one as a spare. You can swap out the OEM pump on the side of the road if you remove the front driver's tire and wheel liner and have the correct allen wrench, but it isn't real easy. If I were you I'd buy Gypsyman's Walbro kit and buy a 2nd Walbro pump to carry as a spare. If you sell your OEM pump to someone else to keep as a spare then you can recoup most of the cost of buying the spare Walbro.

 

[Gypsyman]

I've been curious as to what they actually install in the tank. Is it the type that the pump can be easily eliminated and replaced with a pick-up tube?

The new in-tank pump design is poor at best. I don't think we have enough data to say the pump itself is a poor design but the plumbing in the sender is a nightmare.



1) 80%+ of the pumps flow never makes it out of the sender. They appear to have added an 8 to 10 psi bypass valve right in the sender about 2 inches above the pumps outlet. This is teed right back into the return line so the fuel travels about 6" and is dumped right back into the bowl of the sending unit.



2) They've added a fancy little piece to the bottom of the pump which uses even more of the pumps flow just to open a flapper valve on the bottom of the sender and allow fuel into the bowl. This also creates quite the turbulent little vortex in the bowl when fuel levels are low.



3) No more open screen to allow the bowl of the sender to fill on it's own when fuel levels are low. The only way for the bowl to fill when fuel levels are below the lip is via the tiny flapper valve on the bottom and that can only open when the pump is running.



Like I said, it's a real mess in my opinion. I'll try to get some pictures posted this week if time permits.



Richard