Fuel Pump Limits
Thread Starter
5th Gear Member
Joined: Mar 2008
Posts: 2,825
From: PA
yes, you can run dual FPDM's. Lethal sells a dual kit with the harness and everything you need.
Here is a little info on upgrading(from Lethal's site):
WHEN DO YOU NEED IT?
If you'are running a pair of big returnless fuel pumps (i.e. Lincoln Aviator, Ford Focus, or Ford GT) and/or running '03/'04 SVT Cobra dual pumps with a pump voltage booster in your high-horsepower Mustang you NEED to have your FPDM modified. This modification allows the Ford Mustang driver (99-04) to sink substantially more current (up to 25Amps) without overheating. What happens when the stock driver overheats? It goes into thermal limiting and cuts ALL fuel supply to your engine until the driver temperature drops below a safe level. As I'm sure you're aware, the loss of fuel pressure with your engine at full load can often times be catastrophic!
This modification will NOT require a retune of your vehicle. It will not reduce reliability of the driver or of the system. In fact, the driver will run much cooler than in the stock configuration which will prolong its life even when used with high-flow, high-current dual pumps.
WHEN DON'T YOU NEED IT?
This modification is NOT necessary if you are running stock '03/'04 Cobra dual pumps without a pump voltage booster or a single Aviator, Focus, or Ford GT pump without a pump voltage booster. It will not hurt to do this modification with the above mentioned systems but it is not necessary as those pump setups all draw less than 18Amps at full load.
Here is a little info on upgrading(from Lethal's site):
WHEN DO YOU NEED IT?
If you'are running a pair of big returnless fuel pumps (i.e. Lincoln Aviator, Ford Focus, or Ford GT) and/or running '03/'04 SVT Cobra dual pumps with a pump voltage booster in your high-horsepower Mustang you NEED to have your FPDM modified. This modification allows the Ford Mustang driver (99-04) to sink substantially more current (up to 25Amps) without overheating. What happens when the stock driver overheats? It goes into thermal limiting and cuts ALL fuel supply to your engine until the driver temperature drops below a safe level. As I'm sure you're aware, the loss of fuel pressure with your engine at full load can often times be catastrophic!
This modification will NOT require a retune of your vehicle. It will not reduce reliability of the driver or of the system. In fact, the driver will run much cooler than in the stock configuration which will prolong its life even when used with high-flow, high-current dual pumps.
WHEN DON'T YOU NEED IT?
This modification is NOT necessary if you are running stock '03/'04 Cobra dual pumps without a pump voltage booster or a single Aviator, Focus, or Ford GT pump without a pump voltage booster. It will not hurt to do this modification with the above mentioned systems but it is not necessary as those pump setups all draw less than 18Amps at full load.
4th Gear Member
Joined: Dec 2007
Posts: 1,700
From: Lafayette, LA
No problem and yes, passing the 450rw marker is by no means cheap. Basically, everything from the factory(engine/fuel system/tranny/rear/ect..) comes off and is replaced or built to withstand the power.
4th Gear Member
Joined: Dec 2007
Posts: 1,700
From: Lafayette, LA
As far as the upgraded wiring... i'm not sure on that. But i would assume all that is for is to allow more voltage get to the pumps without burning up or creating a bottle neck. More than likely they are just larger gauge wires.
But i may be wrong.
5th Gear Member
Joined: Nov 2006
Posts: 2,402
From: MA
Yes which is why I am stopping at 475-480 rwhp. The extra cost for heads and fuel system is costly...
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mrappe
V6 (1994-2004) Mustangs
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Sep 26, 2015 10:16 AM
