Fuel Pump Failure APS TT?
Thread Starter
Racer
Joined: Jan 2007
Posts: 415
Likes: 0
Fuel Pump Failure APS TT?
Hello,
After about 4000+ miles of driving I think that my stock fuel pump has died on my APS TT C6. We verified that there is a significant fuel pressure drop to around 50 psi when my boost guage is reading about 2 psi. Once this boost level is reached, the car sputters badly. We pulled the plugs and verified the lean condition (my wideband is not functioning properly - sensor is getting too hot).
I have checked for boost leaks and can't find anything else wrong with the vehicle.
Is there a high probability that the MSD boost a pump will cause stock fuel pump failure??
Thanks,
Conrad
After about 4000+ miles of driving I think that my stock fuel pump has died on my APS TT C6. We verified that there is a significant fuel pressure drop to around 50 psi when my boost guage is reading about 2 psi. Once this boost level is reached, the car sputters badly. We pulled the plugs and verified the lean condition (my wideband is not functioning properly - sensor is getting too hot).
I have checked for boost leaks and can't find anything else wrong with the vehicle.
Is there a high probability that the MSD boost a pump will cause stock fuel pump failure??
Thanks,
Conrad
Melting Slicks
Joined: Apr 2005
Posts: 3,418
Likes: 1
From: Chicagoland Area IL
Simply put you are spinning pump faster do to higher voltage which will accelerate pump wear. But don't forget its summer and when most fuel issues arise especially in hot climates.
Mike
Mike
Safety Car
Joined: Apr 2005
Posts: 4,769
Likes: 0
From: SFV CA
I've known of one incident, a friend's C6 APS TT car...the MSD was set too high (19-20 volts) killed his fuel pump, top piston ring on the #7 cylinder popped up into the combustion chamber. He's now since upgraded to a 402cid TT combo, and utilizing the Magnavolt as a fuel pump booster. I've had no issues with my Magnavolt currently at 5000+ miles, it's digitally controlled, non-adjustable set at no more than 17 volts...bumps voltages at 3-5psi and over 4K rpm, so your not putting the fuel pump through hell when you don't need to. The Magnavolt is the only FP booster unit LAPD recommends on their APS TT installs.
Le Mans Master
Joined: Sep 2005
Posts: 9,864
Likes: 0
From: Central Florida. Black Sheep Squadron Member. 465 rwhp & 477 rwtq
Cruise-In VIII Veteran
St. Jude Donor '07
I've had mine since 12/06 and somewhere around 8k miles and I have not had any problems with my fuel pump.
Burning Brakes
Joined: Dec 2004
Posts: 810
Likes: 1
From: Turbocharged in NC
That sounds like bad news Conrad. I have the Kennebell boost-a-pump on mine instead of the one that APS provides. I use the boost sensing switch with it also, so it doesn't boost until about 2 or 3 psi.
When I installed it, I set the volume pot to its maximum setting. I've never measured the voltage that it sends to the pump under boost. I've just assumed it would only send 17 volts or so to it, and that it wouldn't hurt the pump. Maybe I need to check the voltage coming out of the Kennebell under boost to see what voltage it is really sending. I never knew these things could hurt the pump. I have around 1500 miles on mine now.
Good luck, and let us know what you find.
When I installed it, I set the volume pot to its maximum setting. I've never measured the voltage that it sends to the pump under boost. I've just assumed it would only send 17 volts or so to it, and that it wouldn't hurt the pump. Maybe I need to check the voltage coming out of the Kennebell under boost to see what voltage it is really sending. I never knew these things could hurt the pump. I have around 1500 miles on mine now.
Good luck, and let us know what you find.
Thread Starter
Racer
Joined: Jan 2007
Posts: 415
Likes: 0
Did a little more diagnosis and found that the fuse for the MSD had gotten a little wet/damaged during a HUGE downpour we had last week (large puddles, etc). Fuse was not blown but had a lot of resistance across the terminals. Replaced fuse and checked connections and I'm good to go! Glad it was a simple fix
Thanks,
Conrad
Thanks,
Conrad
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