Fuel Problem
Thread Starter
Burning Brakes
Joined: Sep 2004
Posts: 812
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From: www.shockerracing.com
Fuel Problem
I have a 98 C5 Convertible with a forged bottom end/AFR Heads/Cam/78mm FAST/Procharger P1sc. It runs at 60psi fuel pressure but when I go full throttle the fuel pressure drops to about 40. I have a new Racetronix Fuel Pump and 60lb injectors but the car does not have a Boost A Pump. I was starting to think maybe I need one but when I was looking at MSD's website I noticed it said "NOTE: Not for use on Pulse Width Modulated EFI systems (no return line)" mine is a 98 so I do have the return line. Does this mean that I can't use a Boost A Pump? If so, what else should I check? I have already replace the fuel filter.
Supporting Vendor
Joined: Dec 2001
Posts: 1,573
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From: A dealer near you.
I have a 98 C5 Convertible with a forged bottom end/AFR Heads/Cam/78mm FAST/Procharger P1sc. It runs at 60psi fuel pressure but when I go full throttle the fuel pressure drops to about 40. I have a new Racetronix Fuel Pump and 60lb injectors but the car does not have a Boost A Pump. I was starting to think maybe I need one but when I was looking at MSD's website I noticed it said "NOTE: Not for use on Pulse Width Modulated EFI systems (no return line)" mine is a 98 so I do have the return line. Does this mean that I can't use a Boost A Pump? If so, what else should I check? I have already replace the fuel filter.
You may also consider a dual in-tank system.
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
I have a 98 C5 Convertible with a forged bottom end/AFR Heads/Cam/78mm FAST/Procharger P1sc. It runs at 60psi fuel pressure but when I go full throttle the fuel pressure drops to about 40. I have a new Racetronix Fuel Pump and 60lb injectors but the car does not have a Boost A Pump. I was starting to think maybe I need one but when I was looking at MSD's website I noticed it said "NOTE: Not for use on Pulse Width Modulated EFI systems (no return line)" mine is a 98 so I do have the return line. Does this mean that I can't use a Boost A Pump? If so, what else should I check? I have already replace the fuel filter.
I have a '98 too and I have no fueling issues.
Make sure you are not also getting belt slip, if you are then you voltage will be dropping to the pump.
Thanks,Matt
Former Vendor
Joined: Nov 2008
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From: Texas
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
Plenty of fuel and "O" drop in pressure
Thanks,matt
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