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Guest Message by DevFuse

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Fuel pressure jumping

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1 reply to this topic

#1 djellum


    Eat, Live, Breath Subaru

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  • Vancouver WA

Posted 26 December 2012 - 05:50 PM


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.

#2 skishop69


    If it ain't broke, you're not trying.

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  • Puyallup

Posted 26 December 2012 - 11:32 PM

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

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