Fuel pressure jumping

[djellum]

Hey,

 

prep'n for a Weber swap in the next week or so, so I put a fuel pressure gauge inline to the carburetor just to see where it sits.

 

it pulses quickly between a little above 2psi and 3 psi.

 

question 1) is the pulsing a sign of fuel system problems? It is a cheap gauge so I wouldnt rule out some slight inaccuracy.

 

question 2) is the spike to 3 psi what I should consider the fuel pressure? or the low spot? Im guessing that since it pulses very fast it wont make a difference since the bowl will still have fuel, and im not going over the max pressure required.

 

question 3) is there anything I can do to make this more stable. My initial plan was to run a return line filter, so I can restrict the return a bit to try to get the pressure up to 3.5ish. I can also run dead ended since the pressure isnt over the max.

 

I just got the Weber Haynes manual so ill check it out tonight, any advice would help though.

[skishop69]

Pulsing at low pressures means nothing to a carb. It's the normal function of pump operation on older rigs. It'll be fine.