Can somebody give me a link to a thread showing me how to connect a vacuum gauge to my fuel system so I can see if I have a restriction? I'm not finding it in the stickys, or on a search.
Thanks!
Roger
Thanks!
Roger
Alaskan newb
- Thread starter AKlowriderZ71
- Start date
I looked for you also roger, didnt find what i wanted. I thought you could plug a gauge up, right by the pulleys there was a brass fitting with a black cap covering it.
Are you having fuel issues, or just checking the truck over thoroughly?
-michael
http://www.kennedydiesel.com/detail.cfm?ID=289
Thats the only fuel restriction thing ive seen online for a dmax.
Thats the only fuel restriction thing ive seen online for a dmax.
It set a P0093, large fuel leak detected. The actual fuel rail pressure follows the commanded pretty closely, until it's under heavy load or hard acceleration. Then they are 6-10K psi lower than commanded. As soon as I lift off the throttle, they jump up to over 20K psi, then follow the commanded pressure again. So I was gonna do some troubleshooting.
I know about that brass fitting near the alternator. It has a shrader valve in it. Do I remove the shrader valve? It makes sense to me that the answer is yes, but I'm not sure. If I remove the valve, what's gonna keep the fuel out of my vacuum gauge? Do I need to make something? Also, it seems that I don't have the correct tool for that large of a valve. Where can I pick up what I need?
You are stock, no tune? It should be holding rail with a stock tune.
And yes you can remove the whole fitting from the line and replace it with some fittings to get adapted into your vacuum gauge.
And yes you can remove the whole fitting from the line and replace it with some fittings to get adapted into your vacuum gauge.
I really dont know, ive never done the test before. Im sure albert will know tho. That low on the pump seems pretty bad. hopefully you dont need a new one.
Yes, stock, no tune, no lift pump. Filter was nasty & may have been part of the problem. But I want to do this test to see if there's still a restriction on the feed side. Things like bad filter housing, pinhole in a supply line, or collapsing supply line should show up on this test(I think).
I would say go ahead and test for a restriction... But I think you have something else going on, injectors or Cp3 pump. Does HP Tuners have a way to check balance rates on the injectors?
Balance rate was all within 2% on HPTuners. Injectors were replaced under warranty(according to carfax) about 30K ago. I'm leaning towards a supply side problem, or a weak CP3. Just need to do the testing, I don't like to just make educated guesses.
If the supply side checks out okay, what methods are there for testing the CP3?
If the supply side checks out okay, what methods are there for testing the CP3?
Well before you go after the Cp3 you need to check the return rates... It is harder to do on the LB7. post 287
http://www.duramaxdiesels.com/forum/showthread.php?t=6199&highlight=injector+return+rate+test&page=20
I had 2 bad tips that were causing low rail pressure but had perfect balance rates...
http://www.duramaxdiesels.com/forum/showthread.php?t=6199&highlight=injector+return+rate+test&page=20
I had 2 bad tips that were causing low rail pressure but had perfect balance rates...
Gotcha. Thanks for the heads up. :thumb:
That's me.
I thought so! You've probably seen (heard) my 1/2 ton around town. Do you ever get out to the drag strip? There's gonna be a bunch of FI gassers there on the night of the 23rd for the test n tune.
Just for the fun of it, here's a couple vids of my gasser at the track.
vs a big block Nova.
vs a Mustang, don't remember his mods.
vs a big block Nova.
vs a Mustang, don't remember his mods.
We'll see about the strip, last year I bought drag tires, but had transmission issues, then I was waiting for the trips to come in and just wrote it all off.
This year, I am waiting for some parts from MikeL to put the tranny back together, but work may get in the way. One way or the other, I will be down there just to see what she can do.
In the meantime, I bought Emma, and am in the same situation as you are with a stock transmission again. It's a bummer to have all the tuning capability, and not wanting to start working on ANOTHER transmission. Maybe if I let my wife drive Emma, the Ally will last a little longer...we will see....
This year, I am waiting for some parts from MikeL to put the tranny back together, but work may get in the way. One way or the other, I will be down there just to see what she can do.
In the meantime, I bought Emma, and am in the same situation as you are with a stock transmission again
. It's a bummer to have all the tuning capability, and not wanting to start working on ANOTHER transmission. Maybe if I let my wife drive Emma, the Ally will last a little longer...we will see....
Which tires did you buy? Are they just sitting there, all alone, wishing they were being put to good use? I could help you with that. You know, give em a test, make sure they work....
Sucks having your ride down for broken transmission. I've been there a few times myself.
Sucks having your ride down for broken transmission. I've been there a few times myself.
Ohhhh.....they are not going to go to waste, I think of it as warm storage until I'm ready to go to the track... They are M/T DOT drag tires that will fit on the stock forged wheels. I had an extra set of wheels and was being cheap.
Thanx for the offer though...
They are M/T DOT drag tires that will fit on the stock forged wheels. I had an extra set of wheels and was being cheap.Thanx for the offer though...
