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Author Topic: Carter pump, high pressure at idle.  (Read 413 times)
INTMD8
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« on: April 22, 2019, 07:07:03 AM »

Doing some tuning on my car so temporarily installed a wideband and fuel pressure gauge.

Idle fuel pressure pegs my 10psi pressure gauge.  Not sure how it isn't overpowering the needle/seat in the edelbrock carbs but seems to be fine.

Also found pressure drops to 1psi at 6500 but I found the tank vent is just blocked so going to start there first.

I've not yet checked for a pump part number but my question is, do most usually run a fuel pressure regulator with these to keep idle pressure down? Currently just have a 3/8 feed line to pump, no return line.

Thanks.
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John_Kunkel
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« Reply #1 on: April 22, 2019, 11:45:04 AM »

Mechanical pump or electric? I had a Carter Performance mechanical pump that put out 13 psi, even changing the spring in the pump only lowered it to 10 psi. Wound up installing a regulator.
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INTMD8
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« Reply #2 on: April 22, 2019, 01:24:19 PM »

It's a mechanical pump.  

Sounds like I'll be doing the same, thanks.

Probably overkill but instead of ordering a 5/16 return line I'm just going to install a 1/2" feed line (it already has a 1/2" sending unit), install regulator and use the current 3/8 feed as a return.
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BSB67
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« Reply #3 on: April 22, 2019, 08:10:56 PM »

It's a mechanical pump.  

Sounds like I'll be doing the same, thanks.

Probably overkill but instead of ordering a 5/16 return line I'm just going to install a 1/2" feed line (it already has a 1/2" sending unit), install regulator and use the current 3/8 feed as a return.

Double check your gauge.
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INTMD8
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« Reply #4 on: April 23, 2019, 06:42:18 AM »

Yes I have a Snap on gauge I'll throw on it to compare.  I was checking it with my vacuum gauge which also has 0-10psi section. 

Drove it last night and cold it pegged the gauge but after it was hot held a steady 6.5psi.  shruggy
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TexasStroker
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« Reply #5 on: April 23, 2019, 01:43:46 PM »

Those gauges are notoriously bad...Granted I am assuming you are talking about a small, mechanical gauge and not an electric gauge getting info from a sensor.

I would run a regulator as I've seen Carter over deliver as well...not a bad thing, just needs to be dialed back.

I think the last brand of fuel pressure gauge I picked up was from Fuel Lab...haven't gotten to try it out yet.

Good luck getting it all sorted out...hopefully you have good luck with your gauge.
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