Fuel pressure

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Dave999
Posts: 8507
Joined: Thu Feb 24, 05 10:31 am
Location: Twickenham,London, England

Re: Fuel pressure

Post by Dave999 »

i took my regulator off
with a mechanical pump it just acted as a restriction to flow.

and flow is key....

electric pump any restriction provided may well have not been an issue as it would have maintained the same pressure as well as it could regardless of rpm

mechanical pump pressure and flow varies and not necessarily in the way you would think... its a rubber diaphragm and springs it will have a sweet spot in the rpm range where it is most efficient

not necessarily when the rpm is at the highest you will use.

just turns out that for high ish rpm running on the track the combo of my pump and my holley regulator conspired to create a lack of flow, just when i needed it. i.e as pressure from the pump rose the regulator became a restriction to flow and my float bowls ran low, and i have 3 of them.
with no regulator the problem went away

conclusion
regulator was just a restrictor in the pipe that i did not need.
David Gray. This year i am mainly In Twickenham, sometimes in Watford, often between the two but only between the hours of 07:00 -09:00 and 17:30-19:00

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kma176
Posts: 403
Joined: Sat Jul 11, 15 8:18 pm
Location: Caterham - Surrey

Re: Fuel pressure

Post by kma176 »

Latest on the Fuel pressure!!
After running for an hour or so at the weekend it started flooding the primaries - so removed the carb-nothing obvious with float or needle not sticking in any way :-k Just as a matter of course pulled out my old 35 year old holley and swapped the float and needle - now all seems to run fine and fuel pressure is staying steady between 4 & 6psi when hot even with the reg and return all connected :thumbright: :thumbright:

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Pete
Posts: 20282
Joined: Sun Apr 18, 04 10:49 pm
Location: MMA Chairman

Re: Fuel pressure

Post by Pete »

Well done!
Nobody likes a mystery!

:thumbright: :thumbright: :thumbright:
Pete Wiseman; Cambridge.

Mopar by the grace of God

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