[383 LT1]

Hey everyone I need some help. I have a fuel problem. My lt1 runs real rich at a idle and lean at half throttle I've put new 02s in I've checked just about everything I can think of. One thing I found but don't know if it could make tis happen is my fuel presure is only 32 psi I've orderd a new one. Have not got it yet could this be the problem thanks for any info I can get

 

[fretenborough]

you ordered a new what? Pump? Regulator? What is the MAF reading?

 

[ShowNoMercy]

Is it tuned?



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[donzilla69]

with above said also . check for vacume leaks as well .

 

[Beef supreme]

Check your fuel pressure regulator, I'm having the same problem. 32psi idle and wot I checked my pressure and without the regulator I got 43 psi, my regulator is draining into my fuel tank always, stuck open.

 

[Mystery Bird]

How are you determining these conditions? Do you have a wideband?

 

[383 LT1]

I have orderd a new fuel pump and the MAF is 67 kpa at idle. I'm getting the 32 psi off the regulator. I have had 2 tunes done on it and the tuner is tellin me I'm rich at idel and lean at wot so he tells me that its a bad fuel pump I realy don't c how that can make it do what it is doing it is.

 

[steveo]

a bad fuel pump would NEVER cause a rich idle condition to occur. that's just not how things work

 

[steveo]

please describe this '32 psi off the regulator'. is that with the vac line plugged in? car on? car off? idling? wot? driving?

 

[383 LT1]

That's with the vac on and the car at a idle

 

[ShowNoMercy]

Sounds like a bad fuel pump...

You verified the fuel reg is not leaking? And no injectors are stuck open?



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[383 LT1]

I have not check The vac on the car at a idle but I will. Do u know what the vac should be. I do have some heavy mods on the motor. I have not checked for leaking injectors I did ohm them out and they checked out ok

 

[fretenborough]

Sounds more like a bad regulator then the pump. Do you have a fuel pressure tester? If you do, take the line between the pump and filter off and confirm pressure there. If it's good, bad regulator, if bad, need pump.

 

[383 LT1]

I do have a fuel presure guage but it hooks up to the to the schrader. Is there a adapter that I need to get? What should the pressure be out of the pump. The high and low. I do see it will not hold presure it bleeds down when u have the key off. I did just picked up a rebuild kit for my aeromotive regulator

 

[fretenborough]

Yes you will need an adapter. You can get it pretty much from any auto store. It should key up to 43 psi and not drop less than 33 psi in 5 minutes. If it does replace the pump.

 

[383 LT1]

I can smell raw fuel and I've used data master and u can see it the LTerm and STerm cells I will try and post it on here so u can see what I'm talking about has any one tuned the own cars on here I'm thinking of trying I've had two tuners try and they tell me its the fuel pump I just don't c how that a pump could do this

 

[383 LT1]

Can't find away. To post my log pictures if u would like to c them I can email them too u thanks for all the help I have been getting

 

[fretenborough]

383, e-mail them to me at [email protected]

 

[383 LT1]

Any one know how to do the IAC mod and any pictures my IAc count is 160 cold and 64 warm