Don't worry, it's nothing to worry about. I think any aftermarket AFPR will leak down after some time. You might need half a second more cranking time but otherwise you won't notice it. Now if it dropped to zero while the engine was running... then you'd have issues.

 

im i dont think it is supposed to go to exact zero... but in all actuality i dont think it is an issue.. it may cause a slightly harder start up.. but nothing major.. i have heard of people having troubles with the seal on their walbro fuel pumps and this is a result... but it was my understanding that this was no biggie..

 

Thanks for the replies. I feel much better now. As for startups, It starts right up. It cranks like 3 times and boom. Usually on the third crank it starts and thats how its always been. I also noticed that fuel pressure shoots up super quick at the first crank. I thought it might be a leaky injector.
Also wanted to correct something. I set my fuel pressure when my car is cold. So the figure of 37 I stated earlier with line attached is not the final fuel pressure I get. After its fully warmed and I have driven it for a while, checking it revealed 33psi, not 37 as previously stated. I checked the chiltons manual and it states 33 psi (230kPa) for 95-98 turbo.
With line off I get like 43-44 after its warmed up. (43.6psi?) Any way I'm glad its nothing to worry about

 

It's supposed to do that.

 

What if it goes to zero in a matter of a few minutes or seconds?

 

That would mean the internal check valve in the fuel pump is no good.

 

That would mean the internal check valve in the fuel pump is no good.

Hardly. Aeromotive regs will bleed off instantly in one car and hold on in others for 30 seconds. As long as you dont lose pressure while the car is running dont worry about it.

 

Hardly. Aeromotive regs will bleed off instantly in one car and hold on in others for 30 seconds. As long as you dont lose pressure while the car is running dont worry about it.

Ditto. My aeromotive AFPR falls to 0 within 5 minutes and it works just fine.

 

Same here.

 

Hardly. Aeromotive regs will bleed off instantly in one car and hold on in others for 30 seconds. As long as you dont lose pressure while the car is running dont worry about it.

my aeromotive bleeds instantly and fp drops to 0 the second the car turns off. Starting also took a few more cranks. stock fpr is back on and it holds fp for atleast 20-30 mins and starts better. Why would one aeromotive afpr hold for 5 mins,30 secs and one bleeds off instantly? I think i'm about to sell my afpr and keep the stock one.

 

my aeromotive bleeds instantly and fp drops to 0 the second the car turns off. Starting also took a few more cranks. stock fpr is back on and it holds fp for atleast 20-30 mins and starts better. Why would one aeromotive afpr hold for 5 mins,30 secs and one bleeds off instantly? I think i'm about to sell my afpr and keep the stock one.

I hope you don't mean to put a stock regulator back on with a 255 pump.

 

Again, my apologies for stealing this thread but I am clueless as to what is going on with my car. Again, my aeromotive fpr drops to 0 pressure with in 10 seconds. However, I switched back to the stock regulator and still experienced the same problem: the car is leaning out - to the max. If I even blip the throttle to about 2500 rpm O2 trims jump to 199% and O2 voltage falls to .02!!!! At first I thought it was my logger until I actually drove the car. It drove terribly. It would not build boost and actually started smoking (blue smoke) right after I tried getting on boost. The smoke only lasted about 1 minute then completely went away. I pulled the pump (hardwired walbro 255) and it seemed fine. The oring looked okay as well. The only thing I notice is that it is not making the loud buzzing sound anymore. It is audible but not like before. The fuel in the tank looked pretty clean. This pump only have about 2500 miles on it. Does this issue sound like a dying pump? I already changed out ECU's and swaped fpr's so I know its not that. Any ideas would be a great help. This started happening after the Magnus Intake and Aeromotive installs. Thanks for any help.

 

my aeromotive bleeds instantly and fp drops to 0 the second the car turns off. Starting also took a few more cranks. stock fpr is back on and it holds fp for atleast 20-30 mins and starts better. Why would one aeromotive afpr hold for 5 mins,30 secs and one bleeds off instantly? I think i'm about to sell my afpr and keep the stock one.

The stock FPR is designed to hold pressure so that when you get back out to the car after running an errand there is fuel in the lines and you're able to start right back up. Most aftermarket regs arent designed to do this, they just have to hold pressure while the car is running. Putting on the stock reg is a huge mistake - dont do it.

Going to 0 pressure after the car is shut off is a feature, not a flaw.

 

I agree. I just did that to rule out the afpr. What about the lack of fuel...any ideas on that?