78 cutting out

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Dec 4, 2003 | 01:54 PM

78fordman

Thread Starter

Cargo Master

Joined: Oct 2003

Posts: 2,833

Likes: 4

From: Jefferson, Iowa

78 cutting out

I have a new edelbrock carb on my 78 F-100, and now it is cutting out. It is on a 76 390, and the carb is a 750 edelbrock with a manual choke. You can start it fine, and it will idle just fine, then you accelerate and get up to speed, about 1 minute after going down the road it will start to cut out, almost as if the fuel bowl emptys then it can not get any gas. When i put the carb, a guy told me that there is a fuel filter in there, like the stock for carb, but i found just a little screen. After the cutting out starts, i put a fuel filter on there, a little after the fact. Do you think this is in the carb, or in the pump. It can sit there and idle all day, but after about a minute from taking off, it will start to cut out. I have 3/8 line running from the pump to the carb, i had to replace that, but from my knowlegde, it was 3/8 which was on there. Should i take the carb apart and clean it? I am getting a fuel pressure gauge tonite, but what the pressure is supposed to be? I have adjusted the timing, and it does not help.

Dec 4, 2003 | 10:09 PM

LxMan1

Moderator

Joined: Dec 2001

Posts: 22,436

Likes: 17

From: Louisville,Ky.

Fuel pressure should be around 5-6 lbs.
It could be vapor locking. Check the oil to make sure that the diaphram in the pump hasn't ruptured and it is pumping gas into the crankcase.
Jimmy