five7kid

iTrader: (14)

The 4th gen f-body LS1 tank uses a return (they all do).

The 5.0 reg won't "take care of it", because the plastic 4th gen f-body LS1 tank has the reg built into the return, and so will keep pressure higher than the 5.0 reg set pressure.

scooter

iTrader: (11)

The reg is very easy to remove with just a screwdriver

five7kid

iTrader: (14)

Yes, but that wasn't stated.

penguinpanda0

And as for the aforementioned charcoal canister issues...? (Sorry n00b here..)

And I definitely will have to get new lines correct?

tylercamaro

iTrader: (1)

new lines, you can use your thirdgen ones and slice them together unless youd like to make your own lines front to back. the charcoal canister is that ugly thing that barely worked on the inside of a thirdgens engine bay. most people delete them but a 4th gen has one built in. not necessary to remove them in fact they help for emissions and all that IIRC

82Camaroguy

Thanks for the correction five7kid! I just got my plastic 4th gen tank and lines over the weekend and your correct, they do have a return line, also great point on the regulator, I forgot that the tank is internally regulated on the return side.

88blackiroc

iTrader: (1)

99 was plastic to

Dale

iTrader: (12)

Bringing this back up. #7 would connect to our white check valve thats down on the brake line bracket correct?

five7kid

iTrader: (14)

No need for the white check valve.

Dale

iTrader: (12)

So there are 4 lines...

Send
Return
Line off item 5 goes to engine vac source correct?
What about line off item 7?

five7kid

iTrader: (14)

The one coming off of the EVAP canister with a QD on it but no number goes to a solenoid on the engine.

Nothing is attached to #7. It just hangs out.

scooter

iTrader: (11)

#7 is the pressure relief incase the tank starts to build too much pressure

Dale

iTrader: (12)

Ok, on an LS engine, it goes to a solenoid, but for TPI it would just go to a vac source then.

#7 just hangs. oh, I thought my hose was cut and it went to something.

Thanks, I think I have this figured out now.

penguinpanda0

For a TPI I have to get a vacuum line for EVAP? And connect where?

irocdls1

All of this sounds like alot of work and complicating..... woundnt it be easier and give the same performance putting a gss340 pump and a fuel pressure regulater even though its a little pricey for the regulater....!!!!!!!!!!!!! sorry just want know cause im going that route

Dale

iTrader: (12)

Penguin, You dont have to put it to a vac source. But I dont like the smell of gas fumes, so I'm connecting to a vac source to burn the fumes. Lots of others let it go to nothing.

Iroc. Your talking about a pump.

Zipacna

I assume you have to run some sort of vac back there to control the pressure regulator?

mwfrels

LS1 regulator design does not use idle high vacuum unload. I know TPI cars used it but the LS1 regulator is pure spring pressure. Fuel pressure is constant regardless of throttle position.

M

513camarors91

iTrader: (1)

i currently have a 305 tbi in my car now...my plans are to remove complete fuel system and make it out of aluminum 3/8 line and run a 4th gen fuel filter. no if i run the 4th gen filter would i have to do any thing to the fuel regulater that is in the stock pump. correct me if im wrong but the only time you have to remove it is wen ur going to use the vette filter?and i already have the 4th gen tank and the new fuel sending unit ready for intall

camarotucker

iTrader: (2)

correct, the vette filter has a built in regulator

five7kid

iTrader: (14)

There is no reason to run a Vette filter with the LS1 plastic tank.

3rd gen EFI filter, 3/8" aluminum tubing, LS1 plastic tank:

Strategicsalvag

Using the setup shown above, what causes pressure to be built up in the fuel line to the fuel rail (engine)? Seems to me that if there is no restriction, the flow would be through the filter and immediately return to the tank via the return line. Very little flow and virtually no pressure would be available to the fuel rail......

Just curious.

Strategicsalvag

Sorry, just remembered the fuel pressure regulator is in the RETURN side of the sending unit on the LS1. That is what causes the buildup of pressure to the fuel rail.

In my best Emily Litella impression - "Never mind"........

Zipacna

If you look back through the thread there's actually one disassembled.

penguinpanda0

This. I'm at a loss when it comes to wiring the thing.

jimmy92rs

iTrader: (3)

Wiring is fairly simple. Gray wire is fuel pump feed wire. Black wire is ground and purple is level sensor wire.

penguinpanda0

I know almost nothing about electrical, but it seems disconcerting that only three wires run to the stock pump while there are around eight running to the LS1 pump. I can still just cut the connectors and splice the three from the old connector to the three of matching color and just ignore the rest and it will work?

iansane

iTrader: (1)

You're thinking of the main bulkhead connector that also has wires for the purge solenoid and such. The LS pump setup is almost the exact same number of wires, you just need to add a ground since the tank is not metal.

penguinpanda0

EDIT: I think I understand, the black wire with the white stripe is ground, the rest are the same. Sorry to inconvenience you guys.

92camaro_man

do you have to run new fuel lines to use the ls1 tank for my 305 tbi. It there any way to use my stock lines?

Dale

iTrader: (12)

The hard lines under the car can be the same. But you will need to get adapters for the tank end, the line end, then run an "AN" line in between.

tylercamaro

iTrader: (1)

run an or go cheap and do rubber hose, not suggested but if you rally need to drive the car itd be a temporary fix.

92camaro_man

could a v6 gas tank work? I just want a plastic tank.

Zipacna

Yes I found a v6 tank and a used a v8 sending unit because I needed the higher pressure pump. The tanks are the same 99-02 v6/v8 afaik

cam-

V6 tank is the same and so far as I know the pump is also the same. I can tell you this much its strong enough to run a head/cam LS1 for 3 years lol. Theres no internal reg on the V6 tank though so use the vette filter and you'll be fine

92camaro_man

Sorry to be a bother but im still a little confused.

1) I have a 92 TBI
2) 1999 v6 plastic tank
3) have all plastic lines leaving the sending unit

?: where to buy the "T" bracket ?
?: Do i order the ls1 fuel sending unit from hawksthirdgen?
?: Will i have to remove the regulator off the ls1 sending unit?
?: Could i just change the pump to get more pressure and keep the stock sending unit, or does the pump not separate?
?: What about the an line? how do I know which ones or sizes to get, or how the connector pieces fit?

Please let me know or give me a number where i could call you and hear word for word instruction.

tylercamaro

iTrader: (1)

help section at auto parts strore

not necessary just use the stock v6 unit

if you have the v6 sending unit i believe it should work

ur running tbi you dont need more pressure. youll need a regulator with the v6 pump probably as an ls1 would be overkill for tbi id think.

92camaro_man

On Friday, November 23, 2012. I completed my 4th gen gas tank swap.

Parts Used:
1) 1999 V6 Camaro Plastic Tanks (I pulled it myself so I had all the plastic lines connected to the sending unit)
2) 1992 305 TBI Engine

I did not worry about the gas gauge because it did not work before I made the swap. (I always travel with a 5 gal tank of gas filled. Plus when you drive your car to the point were it runs out of gas, you have a feel to when your car is about to run out) Sure enough my old tank was cracked around the solder, fuel neck and tank. (GM claimed there was no leak).

The car ran fine, used the 1999 camaro fuel filter. I connected the metal lines from the plastic tank to the metal lines of the car with a rubber hose. (This is what was on the car when I removed the old tank so I just used it to make my job easier. I was going to flare the lines using a double end flaring tool but I changed my mind.)

I must say I am satisfied with the results. I filled the tank up to the neck, and drove from Lakeland/Brandon/Tampa/ FL to Tallahassee FL on one tank of gas. (It use to take me two to three tanks with the old tank.)

Sorry I did not take pics of my process, however I am more than will to lead you through the steps to get the job done.

Thanks to everyone on this site who helped me in any way with performing this task.

jazzdadss

I am currious about one thing that I don't see here. On the 99 ls1 pump there are 4 wires going to the pump. The Orange W/Black stripe is a LO Reference wire, Are we not doing anything with this wire? I would guess this would be the ground for the sender??

camarotucker

iTrader: (2)

post #92

jazzdadss

Thanks, sadly I have not been able to open any links on this site for a week or so, Including that link to the pin out...???

mwfrels

I can't open the link in post# 92 either...

M

jazzdadss

Thank you for fixing the link!

mwfrels

Ditto...

M

penguinpanda0

Anybody ever gotten evap to work yet?

cam-

^Not that Im aware of.


In other news a bit of an update worth sticking in here. The original Russel fuel rail adapter fitting shown on the left side here;






has been known to randomly BLOW OFF thus spraying fuel everywhere so anyone who has one should upgrade to the new version that has no plastic clip shown on the right. Also I might as well add that the stock metal clip style retainer clips ( see attached pic below ) work great and have no issues. Obviously not for all purposes as boosted guys need mo bigger lines but these are proven durable and support most NA applications. Be careful with fuel.....

camarotucker

iTrader: (2)

Someone on the boards did. His name escapes me. He was from Cali and iirc he built two cars, one for him and one for a family member. Both with fully functioning emissions.

Justin89Formy

iTrader: (26)

The shop doing the LS1 swap on my car is hooking up the evap I believe. Do you have any certain questions you need answered?

ghettocruiser

iTrader: (4)

You can have evap work perfect. But you need to use the ls1 gauge cluster if you want a fuel gauge. Ls1 pcm sends fuel level as serial data...which also contains information for the evap system to function. If you try to hook up a traditional style fuel gauge that sends a reference voltage to the sender, you HAVE to sever the connection to the pcm and it botches the whole works. Note:4th Gen guys that run traditional fuel level gauges disable evap in the process. (Simplified short explanation)

You cant trick it like other systems with resistors, because the level and pressure in the tank is constantly changing. Even if you fool it into venting like its half full, it won't be working "properly" the other 99% of the time.

If your shop gets it to work without the ls cluster, without mounting another sender in the tank, and using all 4th Gen parts you GOTTA post up!! I'de love to hook evap back up.

J.

penguinpanda0

As far as evap... I'm using the plastic tank with a 305 tpi engine. I never ran a vacuum line to the tank for emissions. Now I'm doing my egr system, and I notice that the egr solenoid is supposed to connect to the old charcoal canister that I no longer have. My goal is to have a functioning egr system and a functioning evap system so that I can hopefully pass CA smog. How would I route my vacuum lines to do this?