Petrol filters - confused...

[kashurst]

Ordered two new fuel filters. I was expecting Delphi 296 filters which I understand can be used with either petrol or diesel.

What has arrived are two Delphi 7111 296 filters which look the same but the box states diesel filter. This has spooked me and I can't get a clear answer if they are OK for petrol. I think they should be but I dont want a future problem.
Anyone know the definitive answer?

 

[Boaty_Pete]

I can only offer some internet search results, but several 'hits' from several angles suggest 'it is widely used on both petrol and diesel' marine engines providing the additives of ethanol etc do not exceed 10%

 

[moresparks]

Someone is bound to correct me but, although the standard CAV296 is suitable for petrol you need to check the flow rate with your engine. I was advised to use the HDF296 but not sure of the differences?
Probably Flow rate .. 150 litres/ hour compared with 50 litres/hour.

 

[Boaty_Pete]

Very good point. Every day is a school day.
Are these 2 filters on a twin-head? If so you can obviously double the LPH.

 

[Hunterlees]

Very good point. Every day is a school day.
Are these 2 filters on a twin-head? If so you can obviously double the LPH.

Can you? Surely only if they were in parallel and not in series?

 

[Boaty_Pete]

Yes in parallel. We don't have much to go on, so I was kinda wondering if this is 2 filters for 1 engine or 2 filters for an engine each.

 

[PaulRainbow]

Yes in parallel. We don't have much to go on, so I was kinda wondering if this is 2 filters for 1 engine or 2 filters for an engine each.

From a previous thread by the OP it sounds like it's one per engine:

K

Thread 'Bleeding a petrol engine after changing fuel filters........'

13 Apr 2026

I have two elderly Volvo AQ125Bs. It's time to change the fuel filters. I think they were last changed sometime last century. One could even be the original filter when the boat was built 40 years ago as it is in a sod of a location and is an OEM Volvo jobby. Never mind. Lots of swearing usually works.
They are the CAV style with delphi style 296 cartridges.

So question, the engines are carburettors with an engine driven mechanical fuel pumps. How do you/ I bleed the air out without a lot of engine cranking???? Is there a simple trick to get the air out quickly?
Thanks.

• kashurst
• Replies: 14
• Forum: Motor Boat Forum

 

[Boaty_Pete]

Google suggests (could be inaccurate) 7-8 GPH at WOT. Which is circa 36 LPM.