Fuel Pressure

[ARTZ]

So I found a leak on my rail the other week, dodgey o-ring..no worries welded a bung in it problem solved..

fit it all back up and prime..

Now with ignition still on ,fuel pressure hits 3bar , then ever so slowly drops down to about 1-1.5 bar then sits there..

I haven't started it up yet and I can't find another leak anywhere. but is it right that it drops still, or should it be holding at 3 bar?

Just want to make sure before I bolt all my pipes back up..

[bzkr33]

From memory my stock pump would prime up to the same and if you left it sitting, it would slowly drop to around about 1.5 almost 2bar as well.

I don't remember the definite numbers but it did drop significantly, with my nismo pump it primes up high and very slowly drops slightly not much though.

[scotty nm35]

Nothing weeping mate? I would just see how it goes. Get it on the dyno will you...

[ARTZ]

Its a tomei pump, good reg..pretty sure it was holding before I got a leak..

[GTSBoy]

Yuh, it's just bleeding pressure out through either the fuel reg, or back via the pump (check valve not working properly).

[ARTZ]

So is it an issue?

[scotty nm35]

Not if there is no leaks... How long does it hold 20psi though?

Wind the reg up and test it at 70psi, then drop it back to where it was. Make sure its running the same pressure though, or don't boost it before the retune.

[STATUS]

No issue, pretty common to drop pressure.

[Moodles2]

How much fuel pressure will the check valve hold if left for awhile? I'm curious what kinda pressure they keep engine startup

[STATUS]

How much fuel pressure will the check valve hold if left for awhile? I'm curious what kinda pressure they keep engine startup

If its all mint it will hold rail pressure.

[ARTZ]

I ran 90psi through mine accidently..the pump started squeeling rather loudly..still ok as far as I know..but now Im uncertain...

[scotty nm35]

It should be fine, most pumps have a relief valve built in. If it still works/starts you will find out on the rollers if it flows well.

Hurry up, Trent should have his dyno fixed soon, get in line quick. lol.