Thread: Fuel Pressure Dropping at boost

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  1. #1 Fuel Pressure Dropping at boost 
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    My car is with my mechanic getting a dyno and everytime it starts to get boost, fuel pressure drops. Just got the zzp 3.4 pulley, zzp fuel rails, and stg 2 intercooler just added. I've been riding with full zzp exhaust 3", their ECM upgrade, and Cai. I've replaced the pressure regulator which thought it worked. Anyone have any ideas?
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  3. #2 Re: Fuel Pressure Dropping at boost 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Check the voltage at the pump under heavy load. If the voltage is dropping, then fuel pressure is dropping.

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  4. #3 Re: Fuel Pressure Dropping at boost 
    Solving problems BrandonHall10's Avatar
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    How old is the filter?
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  5. #4 Re: Fuel Pressure Dropping at boost 
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    @Fivefingerdeayhpunch what would cause the voltage to drop though? Maybe an old pump?

    @BrandonHall10 it has a few years on it. Probably be a good time to replace
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  6. #5 Re: Fuel Pressure Dropping at boost 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Small wiring.

    This is going way back here but I remember the power wire to the pump on the 97-03 cars was rather small. You would increase the wire size to provide more voltage to the pump and keep it constant.

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  7. #6 Re: Fuel Pressure Dropping at boost 
    Turbo is the way to go. BillBoost37's Avatar
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    Yep.. W bodies suffered from small wiring and when rpm are high you are using more power on ignition etc etc. There was a better gauge harness you could add on with a relay so it was directly off the main power.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  8. #7 Re: Fuel Pressure Dropping at boost 
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    I guess that would make sense cause I had to wire in an electric water pump for the intercooler. I'll have my guy test the voltage. Thanks guys I'll post again if anything else happens
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  9. #8 Re: Fuel Pressure Dropping at boost 
    Turbo is the way to go. BillBoost37's Avatar
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    It's fun to do. As long as the car is pre 2004 it'll have the hatch in the trunk, at which point he can probe the wires and go for a ride with extension wires and his multimeter up front or a person in the back watching.
    I drink..so consider that when reading my posts.

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