StalkerLS1

My tuner said I need a good intank FP because at 5500 rpm my stock pump is not supplying enought fuel to the T-Rex (inline)

I'm confused about how to proceed because I thought this would be a simple fix. Just order up a Walbro and drop it in and go. Apparently from the little info I've gotten, it's not as simple as that.

Is it true the Walbro needs extensive modiciations to work on the 99+ Plastic Tanks?

Even if I got a modified Walbro in there.. I heard I have to keep my tank at least 1/2 full at all times because the walbro uses a different method to collect fuel where as the stock pump has some sort of internal bucket or something that keeps it from fuel starvation.

I checked on the Racetronix Plug and Play intank Pump and sent Jack an Email. I got an automated response back that told me I should check his website for further information regarding the release of his 99+ PnP Pumps. Well I checked and all it says is Spring of 03. Vague! <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" />

Any suggestions?

Thanks a LOT!

<small>[ March 05, 2003, 02:21 PM: Message edited by: StealthStalkerLS1 ]</small>

StalkerLS1

Don't everyone reply at once! <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" />

Info for those curious about this too..

http://www.ls1.com/forums/showthread...ght=racetronix

Chris99WS6PWTMET

email or PM me here and we can set up a time for me to assist you. I've installed one in my 99 and one in a buddy's 01. I'm in OP.

(Of course this offer only applies if you are in Jacksonville, FL!! <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> )

<small>[ March 06, 2003, 08:08 AM: Message edited by: Chris99WS6PWTMET ]</small>

StalkerLS1

Thanks Chris!

I am in Jax! You'll have a PM in just a few!

<img border="0" title="" alt="[Razz]" src="gr_images/icons/tongue.gif" />

MIGHTYMOUSE

iTrader: (59)

i can run my tank just as low as i could with the stock pump, yes the pickup is in the exact same location and its the same style of pickup.. on my 98 that is.

i dont see what the big deal is, just get in there and rig something up. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Chris99WS6PWTMET

StealthS - Did you get my email with phone #'s?

Benjamin Russick

iTrader: (1)

Chris99WS6: Do you have a special rate, or hookup for an in-tank pump? I am doing heads/cam in April and will eventually need more fuel for a wet shot. Please let me know. Thanks! Ben

StalkerLS1

Here's a link that had pics and a breakdown of the Stock PUMP assembly for the Plastic Tank Fbodies.

I still don't understand what the problem with installing an aftermarket pump in the assembly? If it was too big okay but typically it's just smaller right?

http://www.ls1.com/forums/showthread...hreadid=216968

red ws6 99

I dropped the tank then cut through the sheet metal with a sawsall. You have less than 1/8" clearance between the sheet metal and tank. I cut basically two holes, only one was required. The pump inlet is larger diameter than stock. The pump inlet goes through a piece of rubber that hold the pump in the pickup. That must be made a little bigger. The other hole I cut was the stock sump "pump" location at the bottom of the pickup. This is not necessary. The sump pump basically kept the pickup full during low fuel levels and high g operations. The 98s dont even have a pickup setup. Basically the hole will act like a baffle keeps some more fuel in the pickup.

This pump works great on 99s, there are tons of cars running this. I have twin turbo TA no problems with fuel delivery.

If you are still using the stock pump, you are definetly loosing fuel pressure. Even the gs340 is only good to about 450-500 rwhp at a base pressure of 58 psig. If you dropped down to 43 psi or hotwired the pump (and ran more voltage) you could get a lot more. You are better off getting an external pump. Most people have switched to 98 tanks so they can be sumped and outlets put at the bottom of the tank. You could do the same thing in a 99 plastic tank, but would require more work, plus nobody that I know has done it.

Gary

<small>[ March 18, 2003, 05:34 PM: Message edited by: red ws6 99 ]</small>

Chris99WS6PWTMET

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Benjamin Russick:
<strong> Chris99WS6: Do you have a special rate, or hookup for an in-tank pump? I am doing heads/cam in April and will eventually need more fuel for a wet shot. Please let me know. Thanks! Ben </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Ben - I cant get it any cheaper than you would find it here from a sponsor. I have done a couple installs though and can help you if you have any questions.

StalkerLS1

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by red ws6 99:
<strong> I dropped the tank then cut through the sheet metal with a sawsall. You have less than 1/8" clearance between the sheet metal and tank. I cut basically two holes, only one was required. The pump inlet is larger diameter than stock. The pump inlet goes through a piece of rubber that hold the pump in the pickup. That must be made a little bigger. The other hole I cut was the stock sump "pump" location at the bottom of the pickup. This is not necessary. The sump pump basically kept the pickup full during low fuel levels and high g operations. The 98s dont even have a pickup setup. Basically the hole will act like a baffle keeps some more fuel in the pickup.

This pump works great on 99s, there are tons of cars running this. I have twin turbo TA no problems with fuel delivery.

If you are still using the stock pump, you are definetly loosing fuel pressure. Even the gs340 is only good to about 450-500 rwhp at a base pressure of 58 psig. If you dropped down to 43 psi or hotwired the pump (and ran more voltage) you could get a lot more. You are better off getting an external pump. Most people have switched to 98 tanks so they can be sumped and outlets put at the bottom of the tank. You could do the same thing in a 99 plastic tank, but would require more work, plus nobody that I know has done it.

Gary </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Gary,

Your saying an inline pump is better than an Intank pump?? I have an Inline pump already and it's the stock pump that's not supplying enough fuel.

red ws6 99

Its cake to install only a few simple modifications are necessary. You have to splice in the pump ( or hotwire it the battery). You have to run a piece of high pressure hose from pump to the outlet. The hose should be long enough to fully extend the plastic pickup. This will allow you to run the tank with lower fuel levels.

You have to enlarge the hole in the rubber boot around the pump for the inlet. Since the pump is slightly smaller diameter you have to put a piece of 1/8" rubber around the pump to hold it in place. I removed the small suction pump (runs off of the stock fuel pump pressure) from the bottom of the fuel pick (what hold the pump). This will allow better flow into the pickup box.

Of course the real work is getting the tank out. You can also cut an access panel in the car so you have to drop the tank. So other than dropping the tank, there is like 30 minutes of work tops.


Gary

<small>[ March 18, 2003, 12:18 PM: Message edited by: red ws6 99 ]</small>

StalkerLS1

I'm not oppossed to cutting an access panel if I could get some pointers.. Like exactly where do you make the cut and what did you use? I assume something like a jigsaw maybe?

I thought I read that the 99+'s plastic tanks are up higher and therefore have less room to make the cut.

Now regarding your modifications to the pump and all. Are you saying you've gotten this to work like stock with the pickup filling an inner bowl?
or are you cutting a hole in the bottom of it?

Thanks

Chris99WS6PWTMET

He's saying an external pump with a tank that is sumped (no pump in-tank) is better. A little more difficult to do on our plastic tanks.

xaon

iTrader: (12)

here's a nice site about cutting in an access panel.

http://www.taekwondoplus.org/z28/fuelpump.html

StalkerLS1

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by xaon:
<strong> here's a nice site about cutting in an access panel.

http://www.taekwondoplus.org/z28/fuelpump.html </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That's really good info!. I like the pics!. It makes you really wonder why GM just couldn't make an access panel like that in the first place.. Why on earth if you had to replace a FuelPump under warranty would not want better access to the pump??

I assume the Cuts were all made with a Dremel and a cutoff wheel? Sparks are obviously no problem?

B

SS00Blue

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by xaon:
<strong> here's a nice site about cutting in an access panel.

http://www.taekwondoplus.org/z28/fuelpump.html </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">One million thanks, Xaon (pronounced shawn, I would assume?)

This is exactly what I needed to start my project this weekend. I can't tell you how happy these pics made me. I'm on my way to LS1M single turbo bliss!

SC-

Chris99WS6PWTMET

Just a word to the wise here: Those pics are of the 98 and below metal tanks. The 99 and up tanks (plastic ones) have a different fuel module assembly set up with the lines and stuff coming in at different angles. Verify exactly WHERE you need to cut your access hole prior to cutting for the 99+'s.

Benjamin Russick

iTrader: (1)

Very informative post! I love this board! Chris, I will get back to you on that, as I will definitely need some help with the pump. Thanks! ben

red ws6 99

On 99s and above the fuel lines come out of the tank and point toward the driver side of the car. So access panel will have to be slightly different, i.e. wider.

Gary