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V1 LeoZug's Montana Street Goblin - '05 Cobalt SS donor
Ross
Goblin Professor
- Ross Goblin Professor
My fuel rail has a schrader valve on it, that I used to measure the fuel pressure, but would be useful for removing air.
Leo Zugner
Well-Known Member
- Leo Zugner Well-Known Member
Ok awesome. Thanks. So if I have that open while cranking I should be able to purge?
ah.b.normal
Goblin Guru
- ah.b.normal Goblin Guru
Be careful, I believe it pumps at 50+ psi!
Leo Zugner
Well-Known Member
- Leo Zugner Well-Known Member
Yikes. So maybe I crank them open it to give some relief.
ah.b.normal
Goblin Guru
- ah.b.normal Goblin Guru
A trick I saw was to use an old hose off of an A/C recharge kit, screw one end onto the Schrader valve port on the fuel rail. Aim the loose end at the ground.
Desert Sasqwatch
Bigfoot Goblin
- Desert Sasqwatch Bigfoot Goblin
Since you can't hear very well, put you hand on the pump after turning the key. You should feel it humming.
Rauq
Goblin Guru
- Rauq Goblin Guru
On my '06 LSJ the fuel pump will run for about 5s with key on engine off once. To get the pump to run again, you'd either have to wait 10 minutes, or the PCM needs to see some RPM. Meaning, if you turn the key to on and leave it there, or cycle it off-on-off-on, you're not going to get any additional fuel pump priming beyond the initial 5 seconds. You can either manually relay the pump at the fuse box or turn it on in HP Tuners.
That being said, I don't remember an empty fuel significantly delaying my first startup.
That being said, I don't remember an empty fuel significantly delaying my first startup.
Rauq
Goblin Guru
- Rauq Goblin Guru
Additional quick thoughts, from what I recall having read the '05 LSJ pump is less flow and less reliable than the '06-07, and the fuel pump module has additional sensors (tank pressure at least). I believe the '06+ module minus the pump is the same for all non-turbo non-XFE Cobalts, so to me it makes sense to put a "standard Cobalt" connector on the harness. Fortunately it's helpful that DF does this on their harnesses, unfortunate that it's a well documented thing that's easy to miss if you don't know to look for it.
Leo Zugner
Well-Known Member
- Leo Zugner Well-Known Member
Thanks for the feedback. I think I’ll bite the bullet and get the new fuel pump.
Leo Zugner
Well-Known Member
- Leo Zugner Well-Known Member
I found the Schrader valve on the fuel rail and when I pushed it I got a little fuel and some spattering. Then after cranking it a little I tried again and got almost nothing. A few tries like this with same results. I'm assuming I'm getting no fuel flow? I went ahead and ordered the '06 OEM fuel pump from rock auto. Hope that works. I just want to drive this **** thing.
Leo Zugner
Well-Known Member
- Leo Zugner Well-Known Member
will do. thanks.
ah.b.normal
Goblin Guru
- ah.b.normal Goblin Guru
I'm sad I can only up vote this ONCE!??? Well life's not exactly fair now is it? "When" is always an open question. I feel sure it will go and you will drive it, it's just having a little teething trouble just now. Try to be patient, building your own car is a luxury many will never know. You are one of the lucky ones!
Leo Zugner
Well-Known Member
- Leo Zugner Well-Known Member
At least I know I never want to build another car…
ah.b.normal
Goblin Guru
- ah.b.normal Goblin Guru
I am 63 y/o, worked on cars since I was 18. I've heard that from a dozen or more guys, I think one guy meant it! It certainly is a fork in the road of life, but I won't be surprised to hear you built this car and decided to do it again. The feeling of driving something you built or even modified is highly satisfying and can be addictive, in a good way. Stay Strong!
Leo Zugner
Well-Known Member
- Leo Zugner Well-Known Member
I love the fabricating and assembling part. And of course the driving part. But I feel like every step of this project has been a pain. Between the super hit-or-miss instructions and the straight up feeling of “I have no idea where this goes or what it is” more times than I can count, I’ve lost enough sleep due to cars. IF I do another car it will be a runner that needs to be cleaned up. This project has devolved into not fun at all.
