Electiric fuel pump issue... Please help

[Mooni]

Ok so I have been lurking around for a while before I decided to post something. I really need some help. I have a 64.5 w a 289 and a holley 4160 carb, inline universal electric fuel pump (5.5-9 lb output) w a adjustable pressure regulator. Here is the issue, I let the pump prime,try to start the car, flooded. Turn the pump off let it sit then use starter fluid and it fires right up. Turn the pun on while its running and almost instantly the engine dies... The carb has a new rebuild. Please help

[Tarmac_69_Mustang]

Turn the PUN on? What's pun?

I have an electric fuel pump and I have no issues. I prime it for 5-8 seconds, 0 to 2 pumps with the gas pedal (depending how cold or hot the engine is) and then fire it up.

what's your fuel pressure regulator set at?

[Mooni]

6 pounds

[Mooni]

I meant pump. Stupid spell check...I'm posting from my phone...

[crzyamerican]

Sounds like what mine was doing when I had a float needle sticking allowing the carb to overfill.

[Mooni]

I disassembled the float adjustment and the needle did have a little hesitation to open but not close.

[Tarmac_69_Mustang]

Your pressure regulator, or your pressure gauge?

Mine is set around 2.5 psi on the regulator and pushing 5.5 to 6 lbs on the gauge.

That's weird. I'm sure you did, but did you double check all the connections? Electrical and hoses?

[Mooni]

Tarmac, thanks for your time. The guage is attached directly to the regulator. To answer your second question, yes I have addressed all connections. I broke the carb down today again to check for any issues. I'm still in the works as far as that is concerned, I will post any findings. But in the mean time please help with any advice. I am a noob to carb tune/rebuild and any good advice will be a great help. Thanks

[Tarmac_69_Mustang]

Again, probably already done, but is the timing correct?

So, when it does fire up, does it stay on? Or does it fire up for a couple seconds then turn off?

[Lukesportsman]

If the car running/dieing is related to pump "ON", then it sounds directly related to psi. Can the regulator be turned down lower? Start at lowest setting and progressively turn it up. You may not be able to go beyond 5 psi. If its a stockish type build, it probably won't run bowls dry and this should help narrow down problem.

I recently bought an SU pump replacement for a pair of SU's. Switched from points style pump to solid state specifically designed for these low psi carbs. I now have an additional Quick Fuel regulator installed as fuel was pushed right out the overflows when ever pump was turned on. I ended up setting (apples to oranges, I know) down to 3.75psi to make it run "right".

Im betting on psi in reality being too high, no matter the current gauge output.

[Mooni]

That is a good observation lukesporsman. I'll have to try that. I'll post the findings as soon as I get in the carb parts that I ordered.

[jimeast]

Off Track, but why not a mechanical pump?

[Mooni]

Not off track, it's how I purchased the car.

[jimeast]

and... why not a mechanical pump?

Originally Posted by Mooni

Not off track, it's how I purchased the car.

[chillininnh]

Originally Posted by jimeast

and... why not a mechanical pump?

+1

I run a mechanical Edelbrock fuel pump, works great without the annoying noise.