help with return style fuel system
Former Vendor
Joined: Jul 2010
Posts: 4,504
Likes: 4
From: Waterloo Ontario
Can you power up the second pump so it runs continuous to see if it will start?
All you should need to do is just jump the wires on the hobb switch.
BTW-are you sure you have lots of fuel in the drivers tank?
Le Mans Master
Joined: Jan 2009
Posts: 7,767
Likes: 19
From: East Texas
your car is a 2001 right? If you have the money just replace the in tank pump with a bigger better racetronix or walbro 255 or whatever works better! since your boosted with big power would be a good investment that's what I did on my stock pump!
can u jump a hot wire to the pump and see if it will run? or jump the A&A pump at the hobs switch like Arun suggested
can u jump a hot wire to the pump and see if it will run? or jump the A&A pump at the hobs switch like Arun suggested
Thread Starter
Pro
Joined: Jun 2007
Posts: 501
Likes: 3
From: Valdosta GA
your car is a 2001 right? If you have the money just replace the in tank pump with a bigger better racetronix or walbro 255 or whatever works better! since your boosted with big power would be a good investment that's what I did on my stock pump!
can u jump a hot wire to the pump and see if it will run? or jump the A&A pump at the hobs switch like Arun suggested
can u jump a hot wire to the pump and see if it will run? or jump the A&A pump at the hobs switch like Arun suggested
Thread Starter
Pro
Joined: Jun 2007
Posts: 501
Likes: 3
From: Valdosta GA
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Le Mans Master
Joined: Jan 2009
Posts: 7,767
Likes: 19
From: East Texas
anything keeping it from getting air in or out? intake or ex.? could just be flooded fouled plugs too
Former Vendor
Joined: Jul 2010
Posts: 4,504
Likes: 4
From: Waterloo Ontario
Throw in a set of TR6's just see if it starts, get the daily driving tune dialed in then go to a non-projected #7 and retune.
Remember don't use CL for tuning.
Drifting
Joined: Oct 2004
Posts: 1,621
Likes: 6
what power level are you at? I bet as stated your plugs are too cold. I use ngk 6 at 700+ hp and they are just fine. THis time of year on e85 I have a bit of a issue with hard start but I suspect its one of my o2 sensors that I know is off getting worse.
Thread Starter
Pro
Joined: Jun 2007
Posts: 501
Likes: 3
From: Valdosta GA
It is alive! Thanks for all your help. 
Got a set of plugs in it and commanded the external pump on and it fired right up.
I also did a compression test while i was in there 112-125 with 6 of them at 115.
The new regulator is coming tomorrow so ill be all set.
Got a set of plugs in it and commanded the external pump on and it fired right up.
I also did a compression test while i was in there 112-125 with 6 of them at 115.
The new regulator is coming tomorrow so ill be all set.
Le Mans Master
Joined: Jan 2009
Posts: 7,767
Likes: 19
From: East Texas
Former Vendor
Joined: Jul 2010
Posts: 4,504
Likes: 4
From: Waterloo Ontario
Why are the numbers so low?
Thread Starter
Pro
Joined: Jun 2007
Posts: 501
Likes: 3
From: Valdosta GA
ok well fuel pressure regulator was not the problem... external pump is not the problem i removed the fuel rails from the equation as well. so i am left with factory pump which i sort of checked and whatever else is left... any ideas?
Thread Starter
Pro
Joined: Jun 2007
Posts: 501
Likes: 3
From: Valdosta GA
Got it finally! There is a check valve in the stock fuel line ( not in the fuel hat as most posts on the corvette forum mention) and apparently it was stuck I couldnt get to it without taking the fuel tank out so i blew air in the line a couple times. After that tested it and pressure held way better than before. Did it again and it got better about how i remember it it still bleeds but i think it is from the external pump not having a check valve. When i get the new rails ill put a check valve on the external pump as well.