Fulvia fuel pressure

[rogerelias]

Hello all. Does anyone out there what the fuel pressure to the carbs should be on the 1600 hf solex carbs, i need the pressure in psi please. I am using a bendix electric pump through a filter king so I can adjust the pressure manually. Many thanks Roger.

[inthedark]

Hi Roger,
not 100 % sure but I believe the 1600 HF should be at 3.5 psi
for confirmation send a PM to Chris he will defo know.
regards
Geoff

[rogerelias]

Cheers. Have sent the  massage

[Neil]

I have looked on CD of Fulvia technical data, for 818.540 engine it should 2.7 to 3.3 mH20 not sure what is in PSi?  I hope that is of some use.  

[rogerelias]

Thanks Neil. I saw the same in my book too. Its something to do with Mercury over water or something like that, maybe some one can convert this to psi for me. 

[ncundy]

10.2mH20 = 1 bar = 14.5psi

so 3m H2O = approx 4.2psi

[Neil]

Quite low pressure then even for 1600HF.

[chrislg]

According to Huib (who has extensive Fulvia experience) on the Viva-Lancia.com Forum the original fuel pump produces a constant pressure of about 0,3 to 0,35 bar which is the correct value for the Solexes.
He went on to say that for some carbs such as the Dellorto DHLB works best with a much lower pressure of 2 psi. In this case a regulator is recommended.

So a pressure of 4.2 psi would seem to be more than enough!

Chris

[rogerelias]

Thanks Chris, Neils 1 &2, and of course the colonel, and everyone for the help, now THIS is when  a forum is very useful. i am going to reset pressure to 2.5psi from 1.5 psi that i am running at the moment, and work my way up ,and see how i get on. has anyone ever done a gas conversion on a fulvia? now thats a challenge.

[peterbaker]

I believe many Lancias were converted to run on gas in Greece

[lancialulu]

Hi all

Just went through this the other month and played around with a red top electric pump / filter king and a pressure gauge.

I was suprised but didnt comment when I saw huib's comments as a mechanical pump is anything but constant but does "smooth out" at above 3000. This was my bench mark as I was trying to see if higher fule pressure would cure a high speed faultering of the carbs which were 35 delortos (see much earlier thread - conclusion was carbs just to small for 1600). Anyway that test started a c2.5psi, then 3psi, then 3.5. made no real difference, so have set at 3psi for 42 mm solexs and not had any problems. Dont forget there is a fuel return line that makes high pressure a bit irrelevant! What you dont want is over fueling at tick over which is why 2nd series had return pipes I believe.

Tim

[rogerelias]

When i last went to Greece i too ran on gas

[Neil]

I also run Dellortos on my Fulvia (1300) and a Filter King filter/regulator, but no idea on the fuel pressure, when the car is back on the road with its new mechanical fuel pump I will need to check.  Also I sealed off the return pipe at the front, should I need it if the regulator is doing its job? 

Neil

[fay66]

When I fitted Dellorto 32 DHLa's to my 1091cc Fulvia 2c Berlina about 5 years ago, I also fitted a filter king, I didn't have a fuel return to worry about but I fitted the fuel king as supplied, and haven't had to check fuel pressure or reset it as it has run fine since fitting, "If it ain't broke, don't fix it"

Brian
8227

[lancialulu]

Seems to me fuel pressure c3-4psi is about right and carbs can cope. However..... My dellorto tech book states that DHLA's should not have fuel pressure exceeding 3psi. I wouldnt expect a stock filter king to be set at this or above.....

Tim