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Old 02-14-2006, 08:19 PM
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losing fuel pressure

have 350 chevy with performer rpm package with edelbrock750 elec. choke. have fuel reg. on and set at 5lbs. When it sits i lose the pressure and it is hard starting like out of fuel. Then when it does start it pops and kinda has a rattle. When warmed up for 5mins. it runs good and stops poping and the rattle stops. any suggistions
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Old 02-14-2006, 11:09 PM
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soundslike your carb bowls are leaking down. Take off the carb, and see if it is leaking down internally.
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Old 02-15-2006, 07:29 AM
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I suspect the ouput side flow check valve in the fuel pump is leaking when cold, simple to test, disconnect the gas line at the carb, rig any old air pressure guage onto the end, crank the starter to build pressure, see how long it holds pressure, I like 3-5 minutes

I just put a NEW Auto Zone pump on....doesn't hold pressure worth a flip

The float needles in the Edelbrock are rubber tipped so if dirt gets in they don't hold pressure hot or cold and the carb stinks

obvious, re-tighten all fittings on the supply line
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Old 02-15-2006, 05:44 PM
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thanks the fuel pump is fine i think it is the floats ill reset and clean to se if that will work
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Old 02-16-2006, 07:42 AM
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tg40,
before you start to check the floats, order the carb gasket kit (approx $10), chances are you will need the airhorn one that covers all the top carb piece....kit is very complete so you may want to clean all which is very simple even with the carb on the motor
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Old 02-25-2006, 08:02 AM
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Same Deal

I have one doing the exact same thing. Put a kit in it. No difference. Mine will start fine when cold, and choke takes over. But when hot and sits for 5 minutes, it is hard to start. It will start easier if I hold throttle completely open so vacuum will suck fuel out of bowls. Tells me they loose their prime for some reason.
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Old 02-25-2006, 09:43 AM
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delwood,

very probably a different problem

go to the engine forum main page and type in "hard starting" in the search box

can be lots of things.....but usually only one answer

worn pump, 5psi cold, 2psi hot (test with a guage)
sticking float (tap on the hot carb then see if it starts ok)
how hot is hot, can be vapor lock (intake cross over not blocked?)
etc
etc
etc

Last edited by red65mustang; 02-25-2006 at 11:55 AM.
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