Upgrading fuel filtration on an IDI VW

[wolf_walker]

Don't argue guys, I posted what Giles said as that is just it, what he said. I think the 2 guys should get together on the phone and share some secrets and then let us know what is up. I own a Giles product and know how it works. I have an inline pump that I can turn on or off and the only difference I have found is upper RPM is better with it on. Makes no difference in feel in the rest of the engine RPM range. If I had to say I would be on Giles side now, but I do not have enough info to make a perfect guess on it...hence I think the 2 guys need to talk as something is not correct.

FWIW, damned if I can see how pressure on the mech VE would make a diff either.  I've looked and pondered real hard a built a couple pumps from parts, I'm not Giles or a European pump wizard by any stretch, but it's not magic in those things.
Dodge runs pressure on the VE mech pump stock don't they? 
I've sure known a lot of people that pump pumps on VW-D's for various reasons and they seem just fine in regular use.

[R.O.R-2.0]

Don't argue guys, I posted what Giles said as that is just it, what he said. I think the 2 guys should get together on the phone and share some secrets and then let us know what is up. I own a Giles product and know how it works. I have an inline pump that I can turn on or off and the only difference I have found is upper RPM is better with it on. Makes no difference in feel in the rest of the engine RPM range. If I had to say I would be on Giles side now, but I do not have enough info to make a perfect guess on it...hence I think the 2 guys need to talk as something is not correct.

FWIW, damned if I can see how pressure on the mech VE would make a diff either.  I've looked and pondered real hard a built a couple pumps from parts, I'm not Giles or a European pump wizard by any stretch, but it's not magic in those things.
Dodge runs pressure on the VE mech pump stock don't they? 
I've sure known a lot of people that pump pumps on VW-D's for various reasons and they seem just fine in regular use.

^^^

THATS WHAT I BEEN SAYING THE WHOLE TIME!!!

[tyb525]

Many people put pumps before the injection pumps for multiple reasons. Several have stated one of the reasons, preventing air in the lines. A vaccum line will tend to pull air in through any fitting that is not 100% tight. A pressurized line (even a very low pressure) will tend to leak fluid out of the fitting, rather than pull air in. So that would solve one of your fears - fuel loss. Air bubbles equal fuel loss, albeit in a small quantity.

Supplying the pump with fuel, rather than making it suck it out of the tank, will always increase its effeciency, because the pump is not having to pump fuel out of the tank and to the injectors.

You are so concerned about a loss of fueling under load. The 100% obvious answer is to use another pump to supply fuel to the injection pump so it doesn't have to supply itself.

1st gen Cummins VE44 pump is a mechanical VE pump. Those trucks came stock with a pump supplying the pump. 'Nuff said.