Excesive pressure in the pump Renault 4

[Antonio]

hi partners!!!
I have a problem.
My car don´t start, I thank that it were a problem with the carb, but I just change for other carb and the problem continue.

It is posible that the problem it is a excesive pressure in the pump (in the intake manifold there liquid fuel)

Thanks

 

[reidalpine]

Hola! I think petrol-pressure should be 0,7 Bar-if exessive it can cause jes in carb to wear our prematurely.
-Solution is to mount a Filter-King (Malpassi) pressure-limiter,this also has the added (and now necessary)
bonus of having a water-separator so you can get rid of lots of water accumaleted by that reched E5 /E10-
mixed petrol..
Fuel-pressure-limiter very easy to mount,fits nicely on inner-wing down in the area where the petrolpump is.
just cut rubber-hose (to pump) insert the two banjo-fittings into each end.Do not forget to install 2 new
hose-clamps. add a drop of oil on hose where clamps go then you won't shear into the rubber and they will
last a lot longer.
Pressure is set by turning knob on top of Filter-King so either you need a pressure-gauge Or order the one with
small gauge included.
Buy an extra filter at same time,nice to have one spare,and you save on postage..
If you order one be sure to get the one with the bowl in Glass not plastic.also make Sure the O-ring gets a few
drops of oil so glass-bowl will fit snuggly and tight against it to avoid leakage.PS Do not overtighten the nut under
the bowl,smear oil on the O-ring and finger-tighten it ,juggle it a bit and re-check.
-Check the hoseclamps whenever you have the bonnet opened just to be sure..
Happy motoring Antonio! -r.

 

[angel]

There is a cheaper way to reduce fuel pressure, Reidar. Just fit a thicker fuel pump-to-block gasket (or add a second one).

 

[Geoff in the Gully]

There is a cheaper way to reduce fuel pressure, Reidar. Just fit a thicker fuel pump-to-block gasket (or add a second one).

cunning...

 

[malcolm]

Do you have the mechanical fuel pump on the side of the engine? I have never heard of those things getting pumped up. More likely that there is dirt in the needle valve in the float chamber causing it to overflow. If you don't have an in-line fuel filter then fit one. Then remove the top of the carburettor and clean out the needle valve and unscrew the fuel inlet pipe and clean that filter.

 

[Antonio]

Thanks for all answers .

I used two different carburetors, Zenith 28 if and Zenith 28 if with acceleration pump. They have the same problem and I think the excess fuel is caused by the fuel pump .

Now I use a pressure gauge to check the pressure output of the pump.

What should be the maximum pressure ? ¿ 0.5 bar? ¿ 0.7 bar?

thanks.

 

[reidalpine]

my info says 0,7 bar. -R.

 

[mr-reno-139]

Maybe a thought if you are experiencing flooding when hot
I have been struggling to sort Ornella the 1965 4 as after switching engine off the carb would stink of fuel
Eventually I noticed there was no spacer between carb and manifold
Found a spare and with 2 new gaskets all is well now