fuel pressure bleeds off?
 

is it normal for my fp guage to bleed off slowly after i turn the koeo? i heard it should hold pressure? it just bleeds off? it takes a few seconds, but eventually goes almost all the way down, car starts up good in the mornings. should i worry?

More detail
 

How much time does it take to go from 40 psi to 0? What is the loss of psi every thirty seconds? You might have a leak some where? If you have a leak I would first check at the fuel pressure regulator. Next check for wetness around the lines. I would also make sure the shredder valve is secure. You can actually take the valve out of the line and clean it. I think it uses a 11/32 wrench. What kind of gauge do you have?

I have the accell guage, i know it's not made for heat, but i leave it on for track duty, and just put a cap on it during the week, i have the needle part of the schrader pulled out.
i do not see, or smell any leaks, i would say it takes 5 minutes to drop off 40 lbs of pressure when i shut it down.

thanx for the help, maybe i shouldnt worry about it, my car ran 13.0 tonight, but it seems to hit a flat spot in the powerband at 5500 rpm, im thinking now it could be the stock springs floating, that will be another post.

Mine takes hours to bleed down. If your sure there is not leak, I's suspect the FP regulator - or possibly a leaky injector but I'd think you would sense other problems with the leaky injector.

the fpr is new? it is a cheaper holley though, not the best afpr on the market.

could an inproperly connected duckbill connector cause this? cuz i know when i installed my pump, i lost my duckbill clip, so i re-used an old chewed up one, i dont think it is even serving a purpose.

mine drops to 0 in like .5 seconds and untill Chris posted a way to check the fuel pump i couldnt find it. my pump is letting fuel flow back into the tank as soon as it shuts down

this was from a earlier post of his

To check for a leaking injector, hook up the fuel pressure gauge, and turn the key on. After two seconds, turn it off, and then back on for another two seconds. Keep doing this until the gauge no longer goes up. Shut off the key, and watch the gauge. It should not drop at all for a minute. Does it? What about after 5 minutes? 10 minutes? let me know.

then he posted on which explained to take a old fuel filter cut out the ends insert some rubber line (i used vacum lime pressurerise the system use vise grips on the line to block any fuel returning from the pump)

when i did that my fuel pressure stayed all night , I dont know if thats a problem with the pump but i know what causes my fuel drop so im happy (I will replace the pump with a even larger one this summer)

I belive that would be the FPR that's causing the problem because the fpr is what lets the gas go back down the return line. It works to hold a certain pressure by letting that pressure build up on the pressurized line and bleeding off just enough gas down the return line to keep it at that pressure with the fuel pump running.

yes but below the set pressure a leak or improper seal will bleed presure down under the set pressure.

heh
 

Mine bleeds down, about a few min or so i think, whats the big deal!?!?

Wow. It's kinda cool reading my own advice written by someone else, and still giving me the credit for it. Makes me feel all warm inside. :)

BILster-
You have done well, Grasshopper! Your problem might be the pump, but it could also be a crack in the fuel line between the pump and where it exits the tank. Be sure to inspect it when you swap pumps.

Coupe50h-
You are developing an internal leak somewhere in your fuel system. While not critical now, it's only going to get worse, so you might want to start looking for it.

The fuel has only three places it can leak to, internally; through a leaky injector, past the FPR, or back through the pump or it's line before exiting the tank.

To determine which, you need to build up pressure, and start blocking off the paths to each of the three possibilities. When the pressure stabilizes, that means you've found the path to the leak, and you'll know what to replace.

:)

Take care,
~Chris