DIY High Pressure Fuel Pump Fix

Welcome to our step-by-step guide on how to perform a DIY High Pressure Fuel Pump Fix, specifically focusing on a 4.0t Audi pump. This tutorial is designed to provide you with all the information and tips you need to successfully repair your fuel pump at home in the event you get a High Pressure Fuel Pump failed high, or a High Pressure Fuel Pump failed low code, saving you both time and money. While we're working on a 4.0t Audi pump, the principles and techniques shown here should be applicable to most normally powered closed pumps. We mostly see this failure when a set of aftermarket fuel lines were installed, but it can also help in the event the High Pressure Fuel Pump has failed due to deposits building up in the High Pressure Fuel Pump over time.
In this video, we'll cover:
A brief introduction to why high pressure fuel pumps fail on the 4.0t.
Step-by-step instructions for repairing issues with your high pressure fuel pump.
Please note that while this guide aims to provide comprehensive instructions for repairing a high pressure fuel pump, it's essential to assess your comfort and skill level before attempting any repairs. Safety should be your top priority.For those who are new to DIY automotive repairs or have any doubts, we recommend consulting with a professional or seeking assistance from someone with experience in car repairs.Remember to like, share, and subscribe for more DIY automotive repair guides and tips. Your support helps us create more content to help you and the DIY community. If you have any questions or need further clarification on any step, feel free to leave a comment below or contact us directly. Happy repairing!

[@hiineedthismachinendlovu6521]

Can this cause suddenly driving off and start again

[@gwot2117]

Can we do this while the HPFP is on the car? Or should it be removed?

[@themanleygarage]

Can be done in the car. Easier if removed.

[@thomasmagiar645]

I have this issue a lot on my Audi as I am running on E 85. Do you connect to a 12 volt car battery? does it matter where plus and minus connects?

[@themanleygarage]

Yeah. 12v to the battery direction does not matter. You could be extra cautious if you’re worried about it, and grab the wiring diagram from ERWIN online with a day use account and download every document available for your specific vehicle.

[@randellgribben9772]

note every 50000 miles ( i do mine at 25000 miles ) replace the tappet/ follower below the hp pump,, and lube the face with engine assb. lube..its easy to do, takes abot 15 mins... this wil keep the cam lobe below the hp pump from wearing

[@themanleygarage]

Good advice.

[@nedlles123]

Hello! Im troubleshooting my friends tuned C63 that cuts all power on full throttle, it sets one code Quantity control valve bank 2 - Short circuit to positive. This is the control valve on one of the hp pump. Have you ever heard of this? He is running Spool performance pumps.

[@themanleygarage]

Yeah, if the delivered pressure is too high above, or too low below specified parameters, the ECU will shut the throttle and put the car into limp mode.
Could be a calibration error, fuel delivery to the pump not functioning correctly (I.E. clogged filter, weak low pressure pump), or a high pressure pump not performing as designed.

[@nedlles123]

@@themanleygarage Yes I found the problem. It was the spool FX-150 hpfp failing. It droped 30-40 bar suddenly on wot. Replaced it with a new 170 and now the car is working fine