Inline fuel filters

Post by **fume** » 30 Jan 2007 02:24 pm

I want to change my 1.7 from the standard fuel filter mounted on the front crossmember to an inline type. Does anyone know what the third pipe on the filter does and what to do with it. I presume its either a breather or a return pipe to the tank. I have a feeling the one on the car is original so it will be working well after 100,000 miles!.

Thanks

Post by **pettaw** » 30 Jan 2007 08:09 pm

third pipe on the fuel pump is the return bleeder back to the tank to take any excess flow away.

The large filter, I dunno how all of that works exactly, tbh because they're not all that common, but I believe they're some sort of catch can to absorb petrol vapour too?

Someone else will clarify

Post by **fume** » 30 Jan 2007 09:22 pm

That would explain why the guy in my local factors told me it couldn't be a fuel filter as it wasn't listed in his book, he reckoned it was a tank to add lead to unleaded petrol!. My last 1.7 had had the filter removed and an inline one put in, or maybe it didn't have one in the first place.

Post by **Chris_C** » 30 Jan 2007 09:35 pm

Yeah, I've only seen a few 1.7's with them, mine certainly didn't have any, but I fitted an inline. I have a feed and return for teh tank going to my petrol pump, and a third connection on the petrol pump going to the carb. I know when I was trying to get another pump there are several versions for the 1.7, one with only a single inlet and outlet, which I guess is what yours is.

Post by **fume** » 30 Jan 2007 10:44 pm

Its amazing how many different variations one engine can have!, i take it that instead of the breather being on the pump its actually on the filter meaning i really need to change the pump to be able to fit an inline filter, and i thought it would be simple! unless of course i just fit the inline between the existing filter and the carb

Post by **Chris_C** » 31 Jan 2007 01:31 am

Yeah, I posted just incase you did need to change the pump as well!!! Lucas don't do the 3 terminal 1.7 pump if you try to get one! Volvo still do though iirc. I'm not sure what effect running the other filter as well would have, pressure reduction wise, I can't imagine it'd be much.

Post by **fume** » 31 Jan 2007 09:37 am

I am going to have a final try this afternoon to try and get hold of an original type like the car has now because it is going to be the easiest thing to do, i don't really want to have to replace the pump as it is working ok but if i can't get a filter i may have no choice.

Post by **Chris_C** » 31 Jan 2007 10:44 am

Chances are Volvo will still do it, and for things like filters they are usually pretty cheap.

Post by **foggyjames** » 31 Jan 2007 08:15 pm

Are you sure it's a filter? I don't know 1.7s very well, but 360 carb models have a 'vapour separator' with three hose connections on it...a little black tube thing. EDIT: And it's not a consumable...you shouldn't need to replace it.

cheers

James

Post by **fume** » 01 Feb 2007 09:46 am

According to the haynes manual it is a fuel filter. I was going to ring volvo yesterday but had an emergency with a coolant hose!. I have now had 6 coolant leaks on my 1.7, surely that is some kind of record !!!!!!!

Post by **redline** » 01 Feb 2007 09:51 am

it is a fuel filter and mounts next to the radiator on the bonnet hinge panel,I will try to find a picture

Post by **lentinj** » 01 Feb 2007 10:04 pm

From what I know foggy is right. What the haynes manual calls the fuel filter is the vapor separator (least, that's what the local volvo garage says). I've never actually opened it, so couldn't say for sure.

Mine has this big cylindrical thing bolted to the front of the engine compartment as well as a small inline filter attached to the fuel pipe coming into the engine compartment from the tank.

Post by **foggyjames** » 01 Feb 2007 10:51 pm

A quick check of VADIS suggests that I'm right...it is a vapour separator.

Not the same in appearance as the B200K one, but VADIS calls it the same thing.

cheers

James

Post by **redline** » 01 Feb 2007 11:25 pm

ok, now this is getting wierd ,

I replaced the one on mine with a brand new one bought in a job lot of old stock new parts and it was deffinately listed as a fuel filter .

although

I can understand how the seller could have been confused, as its easy to presume anything in the fuel line between the tank and the carb would normally be a filter.

Post by **fume** » 02 Feb 2007 09:31 am

Crikey, now i'm confused, i will investigate further when i have solved the cooling problems that have now come back to haunt me yet again.