[parish8]

Perdieu sourced what he is pretty sure is a zl1 in tank pump and sent it to me.

first thing is it fits. it looks identical and everything plugs in. the part number is 23377988 but good luck finding one. Perdieu might be able to help you get one but a i couldn't find any info on that pump. it was a bit of a challenge to swap. I figured out I needed to tie strings to each of the 3 hose connections inside the tank. then after I dropped the pump in the hole pull up on the strings to bring the hoses near the opening and then plug each one in. without the strings there was no way to reach the hoses after the pump was in the hole.

another thing I have no idea how armageden does that set up with the extra pump attached to the stock basket. it is a bitch getting it all in there stock.

I wanted to flow test it under pressure but I didn't get the fittings I needed to do that test so I just did a no pressure flow test. I wired the pump up to a voltage booster I have and put a switch on it. then I connected a hose to the line under the hood and ran it to a gas can. I did 2 tests on each pump. one at 14.5v and another at 16.3v, that is as high as the voltage booster I have will go. I ran the pump exactly 1 minute per test.

stock pump at 14.5v = 11.95lbs of fuel, 1.81gal/min, 6.85L/min, 411L/hr
stock pump at 16.3v = 12.84lbs of fuel, 1.95gal/min, 7.38L/min, 443L/hr
zl1---pump at 14.5v = 13.30lbs of fuel, 2.01gal/min, 7.61L/min, 456L/hr
zl1---pump at 16.3v = 14.73lbs of fuel, 2.23gal/min, 8.44L/min, 506L/hr

i am going to make an assumption that we will see similar percentages of increases when under pressure so lets look at the percentages.

stock at 14.5v to zl1 at 14.5v is about 11% more fuel
stock at 14.5v to zl1 at 16.3v is about 23% more fuel

the zl1 pump saw an 11% increase in flow with a 12% bump in voltage. i am sure we could feed the pump controller with more than 16.3 volts. someone around here said they go to 17.5v. that would be another 7% or about 30% more than we started with.

if the stock pump is good to at least 500rwhp on e85 then a zl1 pump should be good to at least 555rwhp and a voltage boosted zl1 pump should be good to at least 650rwhp on e85.

these numbers appear to be conservative because an otherwise stock zl1 got to over 600rwhp on e85 without a voltage booster.

i did start and idle the car for awhile and got no codes. it is way too cold to go for a test drive but i will try and get out tomorrow. it is likely that pump is drawing a little more power and i am hoping the pump controller doesn't care.

[laynlo15]

Can't you use a boost a pump? I did that on my LSX Malibu I built a few year ago. Doesn't that do the same thing the Zl1 pump does? Is the voltage booster the same thing you were talking about?

[parish8]

Originally Posted by laynlo15

Can't you use a boost a pump? I did that on my LSX Malibu I built a few year ago. Doesn't that do the same thing the Zl1 pump does? Is the voltage booster the same thing you were talking about?

A boostapump is a voltage booster.

Both the boostapump and the zl1 pump increase flow. If you do both you get even more flow. The zl1 pump is cheaper than a boost a pump, less than $200.

[Perdieu]

Outstanding info thanks you for doing all the testing.
Want to loan me your stock pump, I'll send it out with a ZL1 pump to a company I'm working with to design a low side helper set up

[laynlo15]

But if you didn't want to go to all the trouble of cutting the floor out and pulling the old pump out wouldn't the boostapump still work?

[parish8]

Originally Posted by laynlo15

But if you didn't want to go to all the trouble of cutting the floor out and pulling the old pump out wouldn't the boostapump still work?

i am not entirely sure how to respond to this. the data is listed in the post above.

either a boostapump or a zl1 pump will get you more fuel. if that is enough for your power goals then you choose which you are more comfortable with. the pump is under $200 and is a proven reliable factory gm part. i would guess about 3-4 hours to swap the pump without putting a hole in your floor.

both combined will give you even more fuel. for many this level of power will be enough. others will want even more power and need more fuel. at this point they will be looking into adding a meth kit or a 2nd low pressure fuel system or not running e85, maybe thinning it down to e50.

my plan is both a zl1 pump and a boost a pump, max these out and see where i am at. mix my own fuel down to e50 if i want more power. build a max effort fuel system eventually.

[Goertz]

if anyone has a stock fuel pump assembly and would like to help us develop something new lmk

Our plan is to machine a new billet aluminum fuel pump housing that will house 3 pumps and utilize the sock fuel level sending unit.

1 pump will be to go to your stock di system and 2 pumps will be y'd together to go to a supplement fuel system.

I don't feel like pulling my car apart and having it not running for a few weeks since I just got it up again and since I'm funding all the R&D myself not spending $200 on a pump that I won't even be using would be very nice

[solobaric]

Why is the ZL1 pump hard to get right now? Just because it's a new model? Or another reason?

[laynlo15]

Parish, sorry I understood. Just went back and looked again. Oppps

[parish8]

Originally Posted by solobaric

Why is the ZL1 pump hard to get right now? Just because it's a new model? Or another reason?

I am not sure how hard it is to get but I couldn't find it online. You can't look up parts for a zl1 and searching the part number gets you no where. I just know I couldn't get it or even find a part number and perdieu did both.

[solobaric]

Originally Posted by parish8

I am not sure how hard it is to get but I couldn't find it online. You can't look up parts for a zl1 and searching the part number gets you no where. I just know I couldn't get it or even find a part number and perdieu did both.

Hmm. Is that normal not to be able to find ZL1 parts?

[laynlo15]

I thought you had to look it up under LT4 pump

[parish8]

Originally Posted by solobaric

Hmm. Is that normal not to be able to find ZL1 parts?

It is because the car just hit the lots. None of the online parts places have anything listed yet. I am sure they will eventually.

[parish8]

Originally Posted by laynlo15

I thought you had to look it up under LT4 pump

When I think of an lt4 pump I think of the high pressure engine mounted pump. These have been available for awhile because they came on the Z06.

The pump I put in is the in tank zl1 pump.