Walbro 450 problems
Thread Starter
Burning Brakes
Joined: Sep 2013
Posts: 1,160
Likes: 171
Walbro 450 problems
I asked this in the C5 tech section but it seems more people run this pump here. I have a 2004 and just put this pump in. When I turn the key on, the pump primes to 30 psi, then drops to 0 immediately after. I cant start the car to see what the pressure is because its taken apart for a clutch install also.
I was told the pump may not have a check valve but I got an email from Racetronix this morning confirming it does. Where should I start looking first?
I was told the pump may not have a check valve but I got an email from Racetronix this morning confirming it does. Where should I start looking first?
Burning Brakes
Joined: Jan 2012
Posts: 1,145
Likes: 30
From: Orlando FL
I asked this in the C5 tech section but it seems more people run this pump here. I have a 2004 and just put this pump in. When I turn the key on, the pump primes to 30 psi, then drops to 0 immediately after. I cant start the car to see what the pressure is because its taken apart for a clutch install also.
I was told the pump may not have a check valve but I got an email from Racetronix this morning confirming it does. Where should I start looking first?
I was told the pump may not have a check valve but I got an email from Racetronix this morning confirming it does. Where should I start looking first?
-Curtis
Drifting
Joined: Feb 2006
Posts: 1,585
Likes: 15
From: New Hartford IA
Jumper the fuel pump relay so it runs.
Use this for help https://www.corvetteforum.com/forums...interface.html
Use this for help https://www.corvetteforum.com/forums...interface.html
Last edited by slow ride; Jan 6, 2015 at 03:26 PM.
Thread Starter
Burning Brakes
Joined: Sep 2013
Posts: 1,160
Likes: 171
Jumper the fuel pump relay so it runs.
Use this for help https://www.corvetteforum.com/forums...interface.html
Use this for help https://www.corvetteforum.com/forums...interface.html
Thanks for the replies everyone, I was on the verge of buying a new pump assembly and calling it a day. Im sure the BAP and stocker can keep up with 488hp.
Burning Brakes
Joined: Aug 2014
Posts: 1,019
Likes: 30
From: Mentor Ohio
I asked this in the C5 tech section but it seems more people run this pump here. I have a 2004 and just put this pump in. When I turn the key on, the pump primes to 30 psi, then drops to 0 immediately after. I cant start the car to see what the pressure is because its taken apart for a clutch install also.
I was told the pump may not have a check valve but I got an email from Racetronix this morning confirming it does. Where should I start looking first?
I was told the pump may not have a check valve but I got an email from Racetronix this morning confirming it does. Where should I start looking first?
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
Thread Starter
Burning Brakes
Joined: Sep 2013
Posts: 1,160
Likes: 171
Yes, the new pump came with one that is outside the bucket. Is that ok? I followed a how to in the C6 section on installing the pump. Used a few tips on how to mod the bucket and filter placement.
I was gonna jump that relay for the pump but got caught up separating the tt from the tranny. Got it all apart and ready to reinstall into the new clutch. Getting excited (and very nervous at the same time).
I was gonna jump that relay for the pump but got caught up separating the tt from the tranny. Got it all apart and ready to reinstall into the new clutch. Getting excited (and very nervous at the same time).
Safety Car
Joined: Dec 2000
Posts: 4,329
Likes: 10
From: Cape Coral fl
If the o ring in the fuel filter bucket isn't seated correctly, you'll have low or no fuel pressure ( had this problem). The oring may look in good condition, but it is likely swollen from being submerged in fuel for a few years. We had to have two of assemble the filter bucket making sure the oring didn't deform when it was clicked together. The bucket will slip together EASY if the oring is seated properly. Also, if the lines in the transfer pipe aren't seated properly, pressure will be low as well.
If you cycle the key, do you hear fuel splashing in the tank when the pump is running?
If you cycle the key, do you hear fuel splashing in the tank when the pump is running?
Thread Starter
Burning Brakes
Joined: Sep 2013
Posts: 1,160
Likes: 171
If the o ring in the fuel filter bucket isn't seated correctly, you'll have low or no fuel pressure ( had this problem). The oring may look in good condition, but it is likely swollen from being submerged in fuel for a few years. We had to have two of assemble the filter bucket making sure the oring didn't deform when it was clicked together. The bucket will slip together EASY if the oring is seated properly. Also, if the lines in the transfer pipe aren't seated properly, pressure will be low as well.
If you cycle the key, do you hear fuel splashing in the tank when the pump is running?
If you cycle the key, do you hear fuel splashing in the tank when the pump is running?
Ill bet thats my problem. I am visualizing all the fuel being primed and spraying right back out between that oring.
Last edited by ascastil; Jan 7, 2015 at 09:22 AM.
Thread Starter
Burning Brakes
Joined: Sep 2013
Posts: 1,160
Likes: 171
Good news. I pulled the pump back out and blew through the fuel line from the top of the assembly and sure enough, fuel shot out from in between the 2 halves of the filter. I pulled it apart, lubed all the orings, and after about an hour of putting it on and taking it off, it snapped right in place and sealed tight.
There is bad news though. I decided out of curiosity to start blowing through the fuel lines just to see if they were leaking. I found a pin hole in one of the lines that is inside the tank, about an inch from the connectors to the crossover. It is a perfect tiny tiny hole, almost like its supposed to be there. Is that hole there for a reason, or does it need to be replaced/repaired? I didnt have any tools there so I cant imagine where it came from.
There is bad news though. I decided out of curiosity to start blowing through the fuel lines just to see if they were leaking. I found a pin hole in one of the lines that is inside the tank, about an inch from the connectors to the crossover. It is a perfect tiny tiny hole, almost like its supposed to be there. Is that hole there for a reason, or does it need to be replaced/repaired? I didnt have any tools there so I cant imagine where it came from.
Thread Starter
Burning Brakes
Joined: Sep 2013
Posts: 1,160
Likes: 171
Victory for the rookie Corvette guy!!!! Installed the pump tonight, turned the key on and the pressure jumped to 60. I would guess it didnt even hit 40 till about 6-7 minutes later, I wasnt timing it. The key has been out of the car now for close to 30 min and its still holding 40.
Thankyou KLLRVET, thankyou everyone who threw out suggestions!!!! Thanks!!!!! I am going to throw back a few beers and stop stressing!!!!!!!!!!!!!!!!!!
Thankyou KLLRVET, thankyou everyone who threw out suggestions!!!! Thanks!!!!! I am going to throw back a few beers and stop stressing!!!!!!!!!!!!!!!!!!
Last edited by ascastil; Jan 10, 2015 at 03:50 AM.