VE fuel pressure. with mods what psi can it handle?

[TRACTJDS0428]

Ive heard several things. A lot of people will refer back to an article from diesel power and how they talked about rebuilding the pump and ordering a special seal and using loc-tite when installing it. i believe they said something to the effect of "this will hold the 50psi of fuel pressure we are planning on running. Now since i know if the fuel pushes that seal out it will fill the crankcase with fuel im thinking it might be a good idea to know what it will handle with what mods. Anyone running higher pressure than 18psi? if so what did you do for the seal?

[RCCUMMINS89]

Loc-tite it. Anything over 12 psi IMO should be loctited.... but the reality is 15 psi will be fine... but keep in mind that we are pushing the limits of a seal with 20 years on it.

Our seals are actually rated at 14 psi. I've ran upwards of 20 psi without blowing the front seal. I also know on my truck I didn't notice a lick of improvement running anymore than about 12 psi of inlet pressure. The only reason to go higher is you won't pull it down as far.

[BC847]

My mess with 6x.016" injectors will pull 15psi down to a little over 12psi at full song. Frankly, the more I screw with this case-pressure thing, the more I wonder if there's really an advantage to more than 15psi.

[TRACTJDS0428]

I know from reading thru KTA's pump info that the main problem with VE's is people starve them. am i looking to hold 15-18psi all the time or start at a higher psi and not let it fall below a certain number, say 12psi?

[TRACTJDS0428]

My mess with 6x.016" injectors will pull 15psi down to a little over 12psi at full song. Frankly, the more I screw with this case-pressure thing, the more I wonder if there's really an advantage to more than 15psi.

will a high volume low pressure piston lift pump hold flow and pressure as the rpms increase or do i need to look more at a pressure regulated return fuel system?

[BC847]

My mess with 6x.016" injectors will pull 15psi down to a little over 12psi at full song. Frankly, the more I screw with this case-pressure thing, the more I wonder if there's really an advantage to more than 15psi.

will a high volume low pressure piston lift pump hold flow and pressure as the rpms increase or do i need to look more at a pressure regulated return fuel system?

Will it supply 6x.016" injectors? Absolutely not.

What size injectors do you plan on running when all is said and done? That will determine what fuel supply you need.

It's not a thing of pressure so much as it is volume. If you can't keep up with the demand of volume, the pressure will drop.

[TRACTJDS0428]

My mess with 6x.016" injectors will pull 15psi down to a little over 12psi at full song. Frankly, the more I screw with this case-pressure thing, the more I wonder if there's really an advantage to more than 15psi.

will a high volume low pressure piston lift pump hold flow and pressure as the rpms increase or do i need to look more at a pressure regulated return fuel system?

Will it supply 6x.016" injectors? Absolutely not.

What size injectors do you plan on running when all is said and done? That will determine what fuel supply you need.

It's not a thing of pressure so much as it is volume. If you can't keep up with the demand of volume, the pressure will drop.

im thinkin 5x14 at this point.

[RCCUMMINS89]

In order to maintain the same wot psi as idle psi one will need to go electric.

With 72lpm injectors, my 15 psi pump pulls down to about 6psi. w/ 6x16s.... with guessing what they should flow, it might hold 1-2 psi. W/ 5x14s my pump would hold around 5-6psi if the supply lines are large enough. Now, from my experience that is enough to make the same power as it would at a higher psi.

But an electric is superior flow wise to a mechanical lift pump. The advantage the mechanical has is simplicity.

[TRACTJDS0428]

Ok so on my truck with a set of 5x14's and a mechanical lift pump i can expect around 15psi at an idle and around 5-6psi (obviously depending on my exact system those will vary) and that wont hurt to pump if i run it that low? My main concern is i dont want to hurt the pump if i can help it. i know things happen but i want my truck to be somewhat reliable. if the mechanical pump wont the pump cool and lubricated then ill go with an electric and run a regulator and return back to the tank.

[RCCUMMINS89]

The pump in stock form never sees over about 5 psi. I've always felt things are good with anything more than about 3 psi. However, if one were to be starving the pump via vane pump not keeping up, it may help running more psi.

w/ 5x14s and a proper fuel supply (lines, sump) it shouldn't pull it down below 6 psi (remember I extrude hone my injectors and therefore 5x14s I am going to run are about the same as a 5x16 flow wise)....then again every truck is different. Supply lines and pick up tube have a major affect on how low one can pulll it down.

[TRACTJDS0428]

thank you very much for all your help and advice!! I think i have an idea which way to go now!