[Stephen12ZL1]

Originally Posted by Lt4zl1

We even called them directly and they couldn’t answer where the stock zl1 check valve is located. Lol I have my blower off now and it’s no where up top I know that.

I called them directly and they stated "this will not help anything on a nearly stock LT4". I asked if it would help for fuel flow with E85 and the tech said "no help". This new check valve will help in conjunction with a pump upgrade according to the Lingenfelter tech.

[EDFHOBBIES]

If your high side is dropping from inadequate fuel supply from the low side its gonna help some if your low side isnt dropping then no it will not. They use a fore type in tank pump apparently they couldn't feed there high side enough fuel so they made a line and check valve to solve this. I swear I saw the line and valve as unit vs a ck valve only when it 1st came out. Watch the lingenfelter continental sema build you will see then drop the tank and reattach the hard line w ck valve for a split second.

Just give it up trying to make e85 work on stock stuff

[Chris 2018 ZL1 A10]

Hi Guys,

Sorry for the dumb questions but is there something wrong with the OEM fuel check-valve? Does the mechanical HP pump occasionally back-pressure the electric low-pressure pump?
Is this an E85 thing?

Thanks for explaining,
Chris

[EDFHOBBIES]

Originally Posted by Chris 2018 ZL1 A10

Hi Guys,

Sorry for the dumb questions but is there something wrong with the OEM fuel check-valve? Does the mechanical HP pump occasionally back-pressure the electric low-pressure pump?
Is this an E85 thing?

Thanks for explaining,
Chris

It's a restriction when your trying to feed the hi pressure pump. The whole line should be replace back to the after market fore pump or aux pump kit.

It can be used on OEM stuff

https://youtu.be/xlVhWWR708Y

[ramairroughneck]

Some people completely eliminate the check valve with no issue. There’s a thread on CorvetteForum discussing such

[mr911omar]

Originally Posted by EDFHOBBIES

Most of the check valve problems are noise issues that are replaced by GM. Check valve is on the low side that feeds the high side and 99% of the problem is the low side not feeding the high side that will give you low pressure as well. If your making any power with the stock lt4 stuff it needs to be 70 psi under load not falling off I got mine up to 76 with a hiflow valve and the DSX low side that combo still didn't feed the LPE big bore pump enough it needs 80 psi continuously under load with no pressure drop what so ever!

what is you low side pressure I bet anything it falls off just before the high side!

here you go

at wot the goes in engine reduce power and regarding the code are:

- P228C Fuel Pressure Regulator Control Performance - Low Pressure
- P0089 Fuel Pressure Regulator Performance
__________________________________________________ ______________________________________
in winter i dynoed the car it made 680rwhp and 700rwtq when it reached to this level fuel issue came up sadly
in spring the car makes 650rwhp and 680rwtq

*power adder are:
- rotofab
- engine oil cooler
- american racing headers 1 7/8 long system no cats connect to factory muffler
- 170f thermostat
- weapon x cooler
- catch can might mouse
- expansion tank for the supercharger
- Lingenfelter/ATI LT4 wet sump torsional vibration damper
- Lingenfelter 9.17 diameter overdrive supercharger drive damper pulley
- Pulley fasteners
- Supercharger belt
- Crankshaft bolt



relating to the video the weather at that was hot as hell 45c at night sadly she made 630rwhp and 670rwtq



engine oil cooler upgrade

tuned by me ^_^

[swisstyphoon]

Ordered one also, I would like to see some install pictures.
The stock check valve is close to the hard line, I belief the factory braided line has to be cut off the hard line in order to get the old valve out. How did you connect a new hose to the factory hard line?
Is there an adapter available, or did you guys just clamp, or crimp the new hose to the hard line?

[Joshinator99]

I had my shop make up a hose to take the factory connection to the drivers side of the Whipple and mounted the LPE check valve there. I didn’t like the idea of having it hidden and not being able to get to it. LPE also offers adapters to allow you to use the check valve with OEM push lock adapters too (I ended up using one).

[swisstyphoon]

Originally Posted by Joshinator99

I had my shop make up a hose to take the factory connection to the drivers side of the Whipple and mounted the LPE check valve there. I didn’t like the idea of having it hidden and not being able to get to it. LPE also offers adapters to allow you to use the check valve with OEM push lock adapters too (I ended up using one).

Good idea, thanks for the pic.
How did they connect the hose to the hardline on the passenger side? I wonder if a 3/8 female quick connector could fit there also.

[Joshinator99]

Originally Posted by swisstyphoon

Good idea, thanks for the pic.
How did they connect the hose to the hardline on the passenger side? I wonder if a 3/8 female quick connector could fit there also.

No problem!

I think they did the quick-connect fitting in the back to connect to the factory line and ran the custom PTFE hose around to another quick-connect at the LPE check.

[iroc58]

Is anyone running the fore innovate low side system

[Joshinator99]

Originally Posted by iroc58

Is anyone running the fore innovate low side system

You should start a new thread on that FYI. This one is just regarding the LPE high flow check valve.

[iroc58]

Well thats my next question is anyone running the check valve with the fore innovate

[Joshinator99]

Originally Posted by iroc58

Well thats my next question is anyone running the check valve with the fore innovate

No reason you can’t. The Fore system is a return style system but you’d still want a check valve right before you feed the DI system. That prevents the DI HPFP from running dry at startup.