Fuel pump primer question
Thread Starter
Racer
Joined: May 2014
Posts: 361
Likes: 34
From: Central MA
Fuel pump primer question
When turning the ignition to on position but not "start" I used to hear the pump primer sound but now do not. Then when turning key to start the engine it will crank for maybe 3 seconds before it catches and runs. In the past it would start almost right away. There seems to be no other symptoms such as fuel starvation, rough running etc. even under full throttle. No codes are shown for any modules. The battery is 1 yr old and fully charged. I have not done any recent mods or repairs. Any thoughts or advice appreciated! Thanks.
Thread Starter
Racer
Joined: May 2014
Posts: 361
Likes: 34
From: Central MA
I sort of wondered about a clogged fuel filter also. I replaced it last year and have always used Sunoco 93 . It started happening after my last fill up. At that time I added Techron to an almost empty tank and then pumped 8 gallons and added Seafoam in the hopes of distribution to both tanks. Fuel gauge shows a little more than 1/2 tank at this time.
Just went out and started it and heard the primer and relay sounds and started right away. So it is not consistently happening.
Just went out and started it and heard the primer and relay sounds and started right away. So it is not consistently happening.
Le Mans Master
Joined: Sep 2013
Posts: 8,900
Likes: 1,074
From: Wisconsin
I sort of wondered about a clogged fuel filter also. I replaced it last year and have always used Sunoco 93 . It started happening after my last fill up. At that time I added Techron to an almost empty tank and then pumped 8 gallons and added Seafoam in the hopes of distribution to both tanks. Fuel gauge shows a little more than 1/2 tank at this time.
Just went out and started it and heard the primer and relay sounds and started right away. So it is not consistently happening.
Just went out and started it and heard the primer and relay sounds and started right away. So it is not consistently happening.
Team Owner
Joined: Aug 2003
Posts: 24,482
Likes: 311
From: Scottsdale AZ
Similar situation . . took a bit to start . . .then stumbling on harder acceleration.
I got to enjoy the opportunity of replacing the fuel filter and fuel pump last month . . .lovely way to spend nearly a grand all-in.
I got to enjoy the opportunity of replacing the fuel filter and fuel pump last month . . .lovely way to spend nearly a grand all-in.
Thread Starter
Racer
Joined: May 2014
Posts: 361
Likes: 34
From: Central MA
Yes, almost always and I listen for the click and whirr sounds. I don't hear anything when it takes longer to start. Then, briefly it is like I'm out of fuel.
Thread Starter
Racer
Joined: May 2014
Posts: 361
Likes: 34
From: Central MA
Oh no....that doesn't sound good at all. Hope I don't get stranded somewhere. Did you get any codes at all or is that not monitored?
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
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
Le Mans Master
Joined: Sep 2013
Posts: 8,900
Likes: 1,074
From: Wisconsin
I think there is only one and it siphons from one tank to the other. I guess the only way to tell is check fuel pressure in different situations. My wifes car would die once in awhile. Finally it would not start at all. Towed it to the shop and it started right up for them. The tech called and said it was OK. The tech called me back later and told me it would not start. They checked fuel pressure and it was fluctuating from zero to whatever. Bad fuel pump.
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
There are two pumps. On the left is the primary pump which develops pressure and is electric. In the right tank is non electric pump. It is called a jet pump. Part of the pressurized fuel is fed to this jet pump and it draws/sucks fuel out of the tank (like sucking on a straw) and puts it into the left tank. The design is to empty the right tank first.
http://www.z06vette.com/forums/f5/ho...m-works-60056/
http://www.z06vette.com/forums/f5/ho...m-works-60056/
Thread Starter
Racer
Joined: May 2014
Posts: 361
Likes: 34
From: Central MA
There are two pumps. On the left is the primary pump which develops pressure and is electric. In the right tank is non electric pump. It is called a jet pump. Part of the pressurized fuel is fed to this jet pump and it draws/sucks fuel out of the tank (like sucking on a straw) and puts it into the left tank. The design is to empty the right tank first.
http://www.z06vette.com/forums/f5/ho...m-works-60056/
http://www.z06vette.com/forums/f5/ho...m-works-60056/
Le Mans Master
Joined: Sep 2013
Posts: 8,900
Likes: 1,074
From: Wisconsin
Le Mans Master
Joined: Sep 2013
Posts: 8,900
Likes: 1,074
From: Wisconsin
There are two pumps. On the left is the primary pump which develops pressure and is electric. In the right tank is non electric pump. It is called a jet pump. Part of the pressurized fuel is fed to this jet pump and it draws/sucks fuel out of the tank (like sucking on a straw) and puts it into the left tank. The design is to empty the right tank first.
http://www.z06vette.com/forums/f5/ho...m-works-60056/
http://www.z06vette.com/forums/f5/ho...m-works-60056/
