J

John5710

Member

• Jun 25, 2019

• #1

Hi all I have a very noisy low pressure fuel pump behind the rear wheel on my FL1 and wondered if this might have something to do with the rough idling when started at cold.

 

Nodge68

Well-Known Member

• Jun 25, 2019

• #2

Normally idle problems are down to injectors, as small inaccuracies in injector volume or spray pattern, makes the largest proportionate difference to the engine.

The LP pump shouldn't be noisy though.

 

J

John5710

Member

• Jun 25, 2019

• #3

Thanks m8 I did suspect the injectors but today noticed the noisy pump so before I tackle the injectors Ive ordered a new LP pump and filter. Thanks for the quick reply is there a quick check to which injector is at fault ?

 

Nodge68

Well-Known Member

• Jun 25, 2019

• #4

Run a few bottles of Comma Diesel Magic through the system. That's a good cleaner, and can restore injectors that have spray pattern issues.

 

J

John5710

Member

• Jun 25, 2019

• #5

Cheers again I kmow its a daft question but do i put that in the fuel tank ?

 

D

dog-man

Active Member

• Jun 25, 2019

• #6

I bottle per full tank.

 

J

John5710

Member

• Jun 25, 2019

• #7

Thank you so much for your help im lookimg forward to getting this FL1 up to scratch so I will get some comma diesel magic tomorrow and see how we go. Thanks again m8

 

Rocketstu

Member

• Jun 25, 2019

• #8

Sometimes a noisy low pressure pump is due to it being a replacement non OEM version. Mine is the same, works ok but the sound gets a little annoying after a while! Trying to find an OEM version to replace it but they're not cheap!

 

andyfreelandy

Well-Known Member

• Jun 25, 2019

• #9

I heard one the other day that was changing tone while the car was idling, I'm thinking pump or filter or both are needing attention? What happens if you don't empty the sediment pot and it fills up??

 

Nodge68

Well-Known Member

• Jun 26, 2019

• #10

John5710 said:

Cheers again I kmow its a daft question but do i put that in the fuel tank ?

Click to expand...

Yes. I put one bottle to half a tank for an initial dose. It can't hurt to put in more than needed, in fact the engine runs nicer with Diesel Magic in the tank.

 

Nodge68

Well-Known Member

• Jun 26, 2019

• #11

andyfreelandy said:

What happens if you don't empty the sediment pot and it fills up??

Click to expand...

I drain mine once a year, but there's basically nothing in there but fuel.