Could be as simple as a sunk float. Sometimes those floats get saturated and start to sink. Instead of solid brass floats, they are nitrophyl. However, if Cliff recently went through it, this isn't likely. Still possible, just not likely.
The other possibility is the fuel pump. Get a fuel pressure gauge and plumb it inline. Start it up. I would not be surprised if it is 10 - 12 psi. Should be 4 - 6. For some reason, almost ALL of the manufacturers of the new mechanical fuel pumps are using a spring that is TOO STRONG!!! I guess they though if some is good, more is better. That spring determines pressure. Over 7 psi, and most needle and seat valves are just overwhelmed.
Some guys use a needle and seat with a smaller diameter seat. The smaller surface area means it can withstand more pressure before being overwhelmed. I DON'T like this approach, especially on a big cube motor, as that now smaller seat diameter also restricts fuel, and you may starve the engine during a long full throttle run. I have a couple cars I just gave up on mechanical pumps and went to a low pressure electric pump. Kind of a pain, but it is getting really hard to find a good mechanical pump.
__________________
Don't believe everything you read on the internet ... Ben Franklin
Last edited by Lynn; 05-11-2020 at 10:38 PM.
|