raretaco02

Can some one tell me what fuel pressures I should be seeing running and not running

wyoming9

iTrader: (1)

It would depend if your trying to pump Vapor or Liquid

Because was it not you that said it is better to use vapor

hambob

Its 38-44psi running and more than 21psi after stopping after 5 minutes

raretaco02

Yes Wyoming it is but its back factory cause I have a weak fuel pump

raretaco02

It has about 32 pounds before its even started !!!!!

raretaco02

What about compression I bought a comp tester n kinda need an idea of what numbers I should see

UKrunner

1.21 gigawatts.

raretaco02

Seriously

raretaco02

I thought maybe I could get a helpful answer but .........

250000_yota

Good compression numbers will be be around 150-160 psi. There should be no more than 15% difference between all cylinders (within 20 psi).

raretaco02

Thank you very much I got 180 or so on the 4 corners and 168 or so on the middle two ? Is it normal for the middle one to be less or is that a coincident?

Kiroshu

3.4(5VZ-E) Cylinder Compression:

-Standard
(218 PSI)

-Minimum
(145 PSI)

(Reading the above compression seems "normal" and with-in specification.)

3.4(5VZ-E) Fuel Pressure:

Ignition On, engine not running - (38 to 46 PSI)

Engine Idling *Vacuum hose attached* - (31 to 37 PSI)

Engine Idling *Vacuum hose detached* - (38- 44 PSI)

Fuel system hold pressure - (21 PSI)

Kiroshu

raretaco02

Thanks for specs . Can it show normal pressure while key on and idle but still drop out while running down the road or at wot ??? Is that poss and wouldn't that be a volume problem

250000_yota

If it was starting to fail, yes, you could see issues when running. The only way to be sure would be to monitor fuel pressure under those conditions, such as wot like you say. At work we tap into the fuel system with a t and then watch how it fluctuates on a test drive.

raretaco02

OK thanks I believe it is dropping under load its got 206000 on the pump it prob tired thanks for reply

250000_yota

Wouldn't surprise me...my little brother lost one on his 2000. I think he was somewhere around 150k...

raretaco02

Dang I reckon lol I'd say its done its duty huh I really don't know how to check it without the proper tools . Is there any other signs that this could be what's happening or should I just get a new one ? no hard feelings , by the way and thanks for the input I love learning

Kiroshu

Better now then to be stranded in a strange place far from home...

raretaco02

Very true I think we can agree on that lol I go to Ohio to deer hunt every year and its a long way fro. Here so its prob a good idea