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#11
Re: fuel isnt making it to the bowl?
Datsunitus
Posted on: 2008/12/13 18:59
Thanks dodgeman, I just took it off the car now and on the work bench it works. So maybe the spacer is wrong? Or the arm is bent?
 
#10
Re: fuel isnt making it to the bowl?
Dodgeman
Posted on: 2008/12/13 18:49
Quote:
#9
Re: fuel isnt making it to the bowl?
Datsunitus
Posted on: 2008/12/13 18:40
Great comparison picture thank you
#8
Re: fuel isnt making it to the bowl?
ang94541
Posted on: 2008/12/13 18:29
Here's a picture of the long and short arms.
I found an A15 (late) pump replaced the arm with the shorter A12 (early). I had to carefully (carbide) drill out the balls that hold the fulcrum pin and then tapped the hole for set screws. Why? because I couldn't find and early pump. The stiffer spring probably gives me a little more fuel presure too. ![Open in new window](javascript:CaricaFoto("http://datsun1200.com/modules/myalbum/photos/18149.jpg");)
#7
Re: fuel isnt making it to the bowl?
Datsunitus
Posted on: 2008/12/13 17:03
Quote:
It will not work on the A10 & the 1200 engine with the front mounted distributor. Using a late pump on an early engine will result in a broken pump arm. So does a US model 1971 1200 Coupe have a early or late model pump? I am searching for a replacement now. The previous owner had a late model pump on the car but it seems to have died very quickly.
#6
Re: fuel isnt making it to the bowl?
Dodgeman
Posted on: 2008/12/13 15:17
Quote:
It will not work on the A10 & the 1200 engine with the front mounted distributor. Using a late pump on an early engine will result in a broken pump arm. If the fuel was leaving the pump OK, but not reaching the bowl, then either the fuel line is blocked, or the needle & seat in the carb is blocked. Replacing the whole carb over a simple needle & seat problem will not be necessary. Quote:
The crankshaft [crank] does not operate the fuel pump, instead, an eccentric on the camshaft is used to operate the fuel pump arm.
#5
Re: fuel isnt making it to the bowl?
ddgonzal
Posted on: 2008/12/13 10:40
Quote:
Should I be seeing negative pressure on the inlet of the fuel pump on starting crank? Conversely, should I be seeing positive pressure on the outlet? keith did you ever get it sorted out?
#4
Re: fuel isnt making it to the bowl?
frankthedolphintrainer
Posted on: 2008/12/8 9:51
i presume the mitivac is a electric fuel pump?
as i asked earlier what model did the fuel pump come from and what model is it going onto. the reason i ask this is that the crank may not be reaching the fuel pump arm therfor not pump pressure
#3
Re: fuel isnt making it to the bowl?
Keith
Posted on: 2008/12/8 8:04
I can suck fuel from the tank with my mitivac.
I have the steel supply line in the engine bay connected directly to the inlet of the brand new pump then with the outlet hosed to the carb barrel (disconnected) where I can see it from the ignition, when I crank nothing comes out...
#2
Re: fuel isnt making it to the bowl?
frankthedolphintrainer
Posted on: 2008/12/8 7:32
did you get the correct fuel pump as im pretty sure a15 ones wont fit a12 and vice versa. you can also try using a peice of fuel hose sucking fuel from a coke bottle straight into the pump and this will tell if the fuel lines are blocked, then if tahts all good see if fuel is flowing out of the pump. this will show if the pump works, then after that reconnect the lines and disconnect at the carby if fuel comes out i would suggest trying a new carby.
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