ranchertx

My 2001 has the In tank fuel pump. I am not sure when the in tank pump system was installed, so, my questions are:

1. Does anyone have any experience with these? Are they reliable in stock applications, and, how long do they last?

2. Can this system be converted back to a lift pump located outside the tank? What is involved?

Thanks!

BigIron70

Failure rate is much lower then external pump. Most problems I have seen with in tank pumps was the pickup screen getting plugged up. If converting back to external pump may need to install draw straw, if pump is not running will restrict flow rate.

Big Troy

I installed a in the tank fuel pump about 3 years back. I just put a fuel pressure gauge on my truck and it still works but it is a little weak. I also converted back to a external mechanical pump and got a draw straw. Easy to install just a pain to drop the tank.

rigsy340

in tank has almost 0 failure rate. dodge and cummins both want flow rates not pressure. if your seriously bombing add a second lift pump and use the intank 12v to trigger a relay.

mrhemi

I was forced to have the in tank pump installed on my 2002 HO when the VP44 was replaced under warranty (it was a stipulation of a warranty replacement). I was a bit dubious, but it was all done for free. At the same time I installed a fuel pressure gauge to monitor the new lower pressure (but much higher flow). That was years as well as 110000 miles ago with no troubles. Note my truck is not modded with the exception of a 4" exhaust. So my personal experience has been good with that set up.

Mr. Mike.

Midnite

I'm curious--how do they get higher flow with lower pressure? Larger lines and fittings?

KATOOM

Thats a good question because if they utilized the OEM size fuel lines then.....you cant. Volume and pressure are not the same thing. You can have one without the other but to increase the volume in the OEM fuel lines, pressure will also increase simply because there is nowhere for that volume to go.....unless the fuel pump is regulated then there will be neither an increase in volume or pressure. But.....you can increase pressure without increasing volume.

Bottom line is that the in-tank fuel pumps were just as bad as the engine mounted lift pumps, and in most cases, proved to be even less reliable and producing less pressure.

Midnite

That's exactly what I was thinking--if you want more flow with a given pressure, you need bigger lines and fittings. If you want more flow with a given size of lines and fittings, then you need higher pressure.