Replacing Booster Heater Metering Pump

[Guest Hankinson]

Friends, Has anyone put in a new booster heater metering pump? Is it a big job. (I'm exploring this option to eventualy have my heater back in 'normal operation') - Alan, Rotterdam

[Jeff115]

Hi Alan,

 

Have not had cause to replace metering pump but it does not look too difficult in manual.

 

1. Check position before removal

2. Pull fuel hoses off pump and plug

3. Remove pump from bracket

 

4. Re-install...

 

You can test quantity of fuel delivered if metering pump is suspect:

 

Check first:

Resistance = 10

Voltage at pump 11-13 volts

No fault recorded (using VAG-COM)

Fuel pipes, unions etc. are OK

Enough fuel in tank (i.e. not in red area)

 

To test:

1. remove fuel pipe at pressure / heater side and attach new fuel hose to bleed into a measuring glass (25ml capacity)

2. switch booster heater on - after 45 secs the mtering pump will start to deliver fuel

3. hold measuring glass at same height as heater and allow fuel to bleed from pipe into glass for a further 40 secs

4. now pump and pipes are bled so switch off the heater and empty the glass

5. put pipe back into glass and switch on heater again (glass at heater height again)

6. after 90 secs the heater will switch off automatically

7. read measuring glass - quantity delivered should be 7.5 ml to 8.5 ml of diesel

8. if not then suspect metering pump

 

Tel me, why do you suspect the pump?

Did you decoke/de-soot the combustion chamber as suggested by MM - seems to me to be the most likely culprit and caused by the bio-diesel. IMO this would cause overheating within the booster heater which causes your erratic running.

 

Anyway, all the best,

J.

[Guest T120]

Hi Allen

Did you have to replace the metering pump and if so did you have to get the dealer to reset the booster heater on the engine management system and how long did it take them.