This looks like the kit I have in total...no check valve on the stock line area. I do jhave I check vavle to the 2ndary pupm as mentioned.

 

Doesn't look like you have one. Your year is different than mine, I think the factory has some sort of a check valve in with the stock fuel pump. Not sure if you are getting backflow or not, just something to look at. The thing could be stuck open...

I added one on mine so I could go boost referenced inthe future (I don't think I can get more than 62 lbs of pressure without it installled with the 03+ fuel system.

You can get an in line AN 8 check valve from lots of places. ****AN 6 is the size for factory line****

 

Thanks for all your help ! I will call Andy tomorrow and see if I can drill this down. Right now I don't think its electrical but I will be checking that too. Hopefully I get some time after work this week to look into it. I am off to Maine on Friday so we will see.

I will post if I find anything !

 

Keep us updated

 

Just had a buddy watch the fuel pressure gauge while I reved the car in neutral to about 4000rpm. My base FP is 48psi with vacuum. When the car reved it would go up to around 53psi but when I let off it would go down past the base FP to 42psi then come back up. Is that normal for the fp to ever go below its set base?

 

My post above said AN 8 check valve, factory line is AN 6.....

Revving it up should not have had much load on the engine (low fuel needed compaired to under boost.) Some fluctuation in pressure is expected, 6 psi drop seems a little much.

I wish I had more boost referenced experience to lend, haven't ran it yet. I though the base pressure for boost refernced is set closer to 60 not 48 like you have now. Then you build from 60 at a 1 for 1 ration to your boost psi. 60psi base plus 10lbs boost = 70psi fuel pressure. Have you adjusted the regulator to see if you can bring it up to 60psi at idle?

Someone running a referenced system should step in. I think you might be looing for a pump in the near future though.

 

Hey bud. The idea with running the lower fuelpressure is that the pumps will flow more. The base pressure I am at should pose no issue. If I up it my tune will be out of whack. My setup is boost refernce and as you state is supposed to be 1:1 but that is not was happening. It is going lean even before boost now by the looks of it.
thanks

 

Your pressure should drop by .491lbs per inch of vacuum. If you have 15" of vacuum at idle, it should be 50.6psi fuel pressure if you have the base set at 58psi. You check the base by removing the reference vacuum line.

 

i had this problem it was my meth pump locked up!!make sure your getting meth to it!!

 

On my setup I am running 62psi referenced at 0. Idle vacuum has me down at 57 and under engine braking I see low 50s. I am not sure what my in hg are though as my SPA gauge gives me a weird reading (they aren't even sure what it is LOL). I do have a bigger cam so I am assuming it is less vacuum than stock.

This is on a 2000 model, Racetronix harness, Racetronix intank pump and an A&A fuel system BTW. No BAP. Stock rails, 60# injectors. 402 with a D1 making 708/625. Peak boost shows just over 14lbs on SPA gauge and tuner says its closer to 13.5 on the log. Peak fuel is usually around 74psi.

 

this is leaning out before the meth even is set to come on

thanks

 

i have about 17" at idle. I have left the base where it is as not wanting to screw with the tune.

Even with my lower base pressure it should still be fine for the testing I am doing and its leaning way out at only 5000rpm.

I tried to call Andy but he is off today. I have one buddy who is going to check the electrical and when i get the chance I will look more into the mechanical.

thanks

 

I've had similar issues with my A&A system.

We have the BAP and Hobbs switch activation to that secondary pump kicking it all on at 2psi. Base fuel at 58psi, I see about 54 psi under cruise (about 8-9" vac. HUGE cam) and boost tries to grow 1:1 under boost, which it usually does.

The KB BAP is turned to about 16v right now, so room to grow. Off meth we have 11.5 AFR, with we see 10.9 AFR. However, injector DC with my 83s is 92% WOT. This leads me to believe there simply isn't enough pump with the A&A system and that the BAP is simply a band-aid and could lead to weakening the 044 external pump.

I think if I keep the car itll see an A1000 or larger in place of that Bosch pump.

I hope you figure it out.

I can't see it being your intake pump at all since the boost-ref'd pump over-rides this pump under boost. I'd check voltage on external pump and like others said over-ride it and make it your primary.

I've noticed too that when I see belt slip (not saying you have it) I get a large votlage drop at WOT which would only mean that external pump is getting worked that much harder to produce flow at WOT.

Modded cars....it never ends. I'm almost at the point of sayin F it, getting out and sticking with stock stuff!

Best of luck,

Jeremy

 

thanks bud. No belt slip....I run the Flip drive system. Ya this hole project has been a nightmare at times. 4 years and i am still not able to just drive it around how i please. Just when i think everything is sorted out...something else comes to light. This system was working at one time fine...but somethings changed and I cannot figure out easily what. I have no one in my area to really help me either as no one has a setup like mine thats local to my city. Toronto is the closest which is 5 hrs away

thanks for your help.

 

Any way to cap the stock line and run the A&A as your primary and see if the result varies? This should tell you if the stocker is back feeding any.

 

Not sure...I have a buddy thats gonna try and help me with this. Hopefully we get somehwere

 

Quick question...I have a 20amp Kenne Bell BAP hooked upto the second pump. I got rid of the adjustment **** and soldered the two wires together. This makes it full voltage all the time when its activated correct? Just want to make sure.

thanks

 

That's correct.

If you're using the old Hobb switch that Andy had with his kit, you might get his new one, It doesn't like getting wet and over time might corrode the contacts and cause you an intermittent issue with your secondary system.

You know you can call me any time and I'll answer if I can. Let me know if I can help.

 

How old?

 

I love you Brett

I use the new style swtiches as I did have that excat issue in the past with the old one