Submerge fuel pump?
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Originally Posted by schmity
Can you submerge the stock fuel pump inside the tank, or do you need the VW pump that Quick uses. Pros? Cons?
The pump is a small electric motor that has the actual pump housing and impellor at the outlet end of the pump. The fuel is drawn through the spinning electric motor and lubricates the bearings at the same time. At no time is there any air space or dry part of the pump. It is completely "submerged" on the inside of the pump.
Follow me so far? The inside of the pump is completely filled with fuel and no air is mixed with it. Fuel has to have oxygen to burn. No oxygen=no ignition=no fire danger whatsoever, even with the brushes sparking as the armature spins.
The fuel pump relies on the fuel to be a lubricant for the bearings, etc.
.
So it makes no difference whatsoever whether the fuel pump is submerged or not. As far as the fuel pump is concerned, it's just another day at the office.
Thread Starter
|
Senior User
Joined: Dec 2005
Posts: 133
Likes: 0
Originally Posted by Kwikkordead
A little explanation of how the fuel pump is designed will help you to understand that it's perfectly ok to submerge the pump.
The pump is a small electric motor that has the actual pump housing and impellor at the outlet end of the pump. The fuel is drawn through the spinning electric motor and lubricates the bearings at the same time. At no time is there any air space or dry part of the pump. It is completely "submerged" on the inside of the pump.
Follow me so far? The inside of the pump is completely filled with fuel and no air is mixed with it. Fuel has to have oxygen to burn. No oxygen=no ignition=no fire danger whatsoever, even with the brushes sparking as the armature spins.
The fuel pump relies on the fuel to be a lubricant for the bearings, etc.
.
So it makes no difference whatsoever whether the fuel pump is submerged or not. As far as the fuel pump is concerned, it's just another day at the office.
The pump is a small electric motor that has the actual pump housing and impellor at the outlet end of the pump. The fuel is drawn through the spinning electric motor and lubricates the bearings at the same time. At no time is there any air space or dry part of the pump. It is completely "submerged" on the inside of the pump.
Follow me so far? The inside of the pump is completely filled with fuel and no air is mixed with it. Fuel has to have oxygen to burn. No oxygen=no ignition=no fire danger whatsoever, even with the brushes sparking as the armature spins.
The fuel pump relies on the fuel to be a lubricant for the bearings, etc.
.
So it makes no difference whatsoever whether the fuel pump is submerged or not. As far as the fuel pump is concerned, it's just another day at the office.
Did you ever switch to pvc wiring?
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Originally Posted by schmity
I understand completely, I just wasn't sure if the factory pump was the same design as the VW.
Did you ever switch to pvc wiring?
Did you ever switch to pvc wiring?
The lack thereof of the two latter parts, so far, has made no difference at all in the starting ability of my truck. Cold, hot, halfway in between, sitting for a week or just for a minute. It always starts immediately.
I haven't bothered with pulling the tank out and changing the wires yet because I have a section of the same wire sitting in the back room at work in a jug full of diesel. So far the insulation hasn't even softened up yet and it's been a long time. Other projects take thier place in the meantime.
