Radix Fuel Pump?
Aug 11, 2006 | 12:26 PM
#11
Originally Posted by dewmanshu
yours is certainly tunable. SD brings those type of issues out. That's my opinion.
what year are you? that doesn't sound good. mine spikes on the initial on, then settles to maybe 53-55. If you are pre-04 check your fpr.
what year are you? that doesn't sound good. mine spikes on the initial on, then settles to maybe 53-55. If you are pre-04 check your fpr.
Once the truck is started the pressure is always around 60
Aug 11, 2006 | 12:33 PM
#12
Originally Posted by Dub Silverado
I take back my previous statement. I just went to lunch and checked out what the gauge is doing. When i turn the key to run it spikes up to 60psi right away. If i leave it in run but dont start it, it will drop all the way back down to zero.
Aug 11, 2006 | 04:45 PM
#14
Originally Posted by BlownChevy
you need to pull the pump assem back out and re-install the pump.....there is an oring in the module that is not in properly.
Aug 11, 2006 | 07:26 PM
#15
Originally Posted by Holty
where is this o-ring your talking about? does it only apply to a stock pump or could this be my problem with the walbro 255lph pump? ('03 return system).
Aug 11, 2006 | 07:46 PM
#16
Launching!
Joined: Apr 2006
Posts: 272
Likes: 0
From: Grande Prairie, Alberta, Canada
[QUOTE=dewmanshu]yours is certainly tunable. SD brings those type of issues out. That's my opinion.QUOTE]
Yeah, I definately noticed it right after SD was done. One thing I have noticied, is that in the last few days I have not noticed it not starting as good. (Therefore it is starting properly, lol) So maybe it is not SD tuning related. Will wait and see in a few more cold starts.
Yeah, I definately noticed it right after SD was done. One thing I have noticied, is that in the last few days I have not noticed it not starting as good. (Therefore it is starting properly, lol) So maybe it is not SD tuning related. Will wait and see in a few more cold starts.
Aug 12, 2006 | 06:28 AM
#18
[QUOTE=m7 rocket]
the sd tune is finicky like that. LOL
Originally Posted by dewmanshu
yours is certainly tunable. SD brings those type of issues out. That's my opinion.QUOTE]
Yeah, I definately noticed it right after SD was done. One thing I have noticied, is that in the last few days I have not noticed it not starting as good. (Therefore it is starting properly, lol) So maybe it is not SD tuning related. Will wait and see in a few more cold starts.
Yeah, I definately noticed it right after SD was done. One thing I have noticied, is that in the last few days I have not noticed it not starting as good. (Therefore it is starting properly, lol) So maybe it is not SD tuning related. Will wait and see in a few more cold starts.
Jan 1, 2008 | 08:54 AM
#20
TECH Addict
Joined: Feb 2004
Posts: 2,120
Likes: 0
Are you talking about your 99 Silverado? If so there is a fuel pressure regulator on your driver's side fuel rail with a vacuum line attached to the intake manifold. It has a diaphragm in it that can leak and cause a problem. It also has an o-ring in it that can be a problem, but mostly if it has been apart.
To check the regulator run your engine and then turn the key off. Pull the vacuum line from the regulator and check for fuel. If the line is wet the diaphragm is split and the regulator will need to be replaced. The truck will not run or start properly if the regulator is not functioning properly.
If the o-ring is gone the regulator will not hold a static fuel pressure with the key on engine off.
To check the regulator run your engine and then turn the key off. Pull the vacuum line from the regulator and check for fuel. If the line is wet the diaphragm is split and the regulator will need to be replaced. The truck will not run or start properly if the regulator is not functioning properly.
If the o-ring is gone the regulator will not hold a static fuel pressure with the key on engine off.