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Old 03-20-2016, 12:57 PM
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Default Fuel pump

Hi guys, Lost fuel presure on my 1999 Trans am with the key on its at 20psi, at idle drops to about 15. Is it the regulator filter or what? the car will start but to keep it running i have to feather the gas
Old 03-20-2016, 01:54 PM
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Nothing wrong with changing the filter first, just in case it's blocked and that solves the problem. But I would plan on having to replace the pump as well. The regulator is part of the pump assembly, it's all in the tank.
Old 03-20-2016, 08:32 PM
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I thought the regulator was in the middle of the fuel rail?
Old 03-20-2016, 09:10 PM
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Originally Posted by Ryankonopka
I thought the regulator was in the middle of the fuel rail?
this is a common misconception

your actual fuel pressure regulator is in the tank on top of the fuel pump itself.
Old 03-20-2016, 09:11 PM
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read this thread, will educate you and might fix your issue

https://ls1tech.com/forums/fueling-i...ssue-read.html
Old 03-21-2016, 08:01 AM
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The regulator was on the rail for the LT1, but as stated, not the LS1.
Old 03-21-2016, 09:59 AM
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ok thanks guys, How hard is it to drop the tank? is there any step by step instructions on here?
Old 03-21-2016, 10:06 AM
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Originally Posted by Ryankonopka
ok thanks guys, How hard is it to drop the tank? is there any step by step instructions on here?
there is an alternative to dropping the tank , search trap door mod.

Basically it involves cutting out the metal above the tank then adding an access plate to cover the hole like what w bodies have. I wouldn't do it on a collectible low miles high value car but my m6 car in my sig already has it done and any of my others would get the same , once its done fuel pump access is easy.
Old 03-21-2016, 01:46 PM
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Originally Posted by murphinator
I wouldn't do it on a collectible low miles high value car
Honestly, even in this case I would and will if I ever have to. It's not something that would ever be visible, nor is it harmful to chassis integrity. Some cars have these access panels from the factory as you mentioned. IMO, doing this mod is just correcting a factory oversight (sort of like drilling access holes to remove the rivets for power window motor replacement.) The factory put cut provisions in the rear carpet for access to the shocks, and they should have done something for the pump as well.
Old 03-21-2016, 02:56 PM
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The car is almost in mint condition no rust anywhere I dont wanna put holes in it....I would apresciate it if you can lead me to any type of form to drop it. Also I saw a msd fuel pump and reg for $160.00 are there any brands you guys recommend?
Old 03-22-2016, 09:06 AM
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I found a really good video on just to cut into it. So I guess im just going to go this way where is the regulator is it on the pump?
Old 03-22-2016, 01:15 PM
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Originally Posted by Ryankonopka
The car is almost in mint condition no rust anywhere I dont wanna put holes in it....
Originally Posted by Ryankonopka
I found a really good video on just to cut into it. So I guess im just going to go this way
Mine is a 17k mile 97-point show quality car, but I would/will still do the access panel as it should have been done from the factory and won't be visible once complete.

Originally Posted by Ryankonopka
where is the regulator is it on the pump?
The regulator is part of the assembly/module, and it's included if you buy a new complete assembly/module. If you buy a "pump only" you won't get this part, and you'd have to reuse the rest of the factory module.
Old 03-22-2016, 10:02 PM
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Dont drop the tank, just cut the top, do a search there a google video. I done it and it saved me big time, bc now I have to change the sending unit also. If you get a fuel pump just get the racetronix with the hotwire kit also.
Old 03-23-2016, 08:01 PM
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Originally Posted by Ryankonopka
The car is almost in mint condition no rust anywhere I dont wanna put holes in it....I would apresciate it if you can lead me to any type of form to drop it. Also I saw a msd fuel pump and reg for $160.00 are there any brands you guys recommend?
your more than welcome to drop the tank. However I will bet $100 you will hate your life about halfway through, probably right about the time your halfway done with dropping the rear axle.


do the trap door, seriously youll forget its there and its no big deal at all.

your call though.
Old 03-24-2016, 09:14 AM
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Cut it out last night, figured i would drop a pic for anyone trying to do this on there 99+ TA. Still waiting for my racetronix 255l/hr to come, Just woundering sinse this pump has a little more juice than the stock, would upgrading my fuel rails show a noticable difference?
Attached Thumbnails Fuel pump-img_1401.jpg  
Old 03-24-2016, 09:58 AM
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Originally Posted by Ryankonopka
Cut it out last night, figured i would drop a pic for anyone trying to do this on there 99+ TA. Still waiting for my racetronix 255l/hr to come, Just woundering sinse this pump has a little more juice than the stock, would upgrading my fuel rails show a noticable difference?

your stock fuel rails will not be a restriction on any setup with a 255 pump
Old 03-25-2016, 03:03 PM
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I cant get the washer holding the pump in to twist out any advice?
Old 03-26-2016, 05:46 AM
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Originally Posted by Ryankonopka
I cant get the washer holding the pump in to twist out any advice?
Do a search with my name and check out my write up. Details easy way to do it.



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