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Old 04-10-2007, 06:22 PM
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Pontiac 400 fuel pump

I have a pontiac 400 that I put into an 85 buick regal. My question has to do with the fuel pump. The fuel pump works but when I have the line to the carb connected it will not pump fuel. I disconnected it from the carb because I thought i had a stuck float but the fuel is not even going through the line at all. what could be my problem? It has the mechanical fuel pump on the block.

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Old 04-10-2007, 06:52 PM
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Doc here,

Does the Regal Body have an in tank electric Fuel pump?

If so, your going to have to remove that..it's blocking the fuel pickup/flow out of the tank.

Doc
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Old 04-10-2007, 09:04 PM
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i don't think it has an in tank pump. the v6 that i took out of the car had a mechanical pump on the block. i blew into the fuel lines with a blower and gas came out of the lines steadily when i stopped blowing.
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Old 04-10-2007, 09:16 PM
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Doc here,

Did you install any in~line filters? Be sure the direction of flow is correct..(they only flow in one direction).

Next get about 5 feet of gas line, hook it to the mechanical pump, into a 5 gallon can of gas (well away from the car, with the coil + wire pulled) and open the carb inlet, crank and verify fuel comes out of the fuel inlet..If not the pump is bad or not installed (on the rod) correctly.

If that checks, pull the line from the fuel tank, plug it tightly, get a hand vacuum pump, and pump the fuel pump inlet side down to about 10 inHg, It should hold at least a minute, If not, look for leaks, pin holes , dent/cuts along the line between the pump and the tank.

If that is good pull the fuel inlet egress door for the inlet and sender at the tank, the filter sock may be clogged and wadded up upon itself.

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Old 04-13-2007, 03:25 PM
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I changed the fuel pump. it pumps good but when i pour gas into the carb it will only run until it eat all the gas that i pour into the carb it don't seem to be getting gas from the fuel line. the gas is getting up there just not into the carb.
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Old 04-13-2007, 08:19 PM
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I've only seen it happen once, but could you have put the fuel pump on with the rod over the top of the ecsentric thats on the front of the cam gear? Or did you hook the lines on the pump backwards? Out/in, in/out etc.

Bill
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Old 04-13-2007, 09:59 PM
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Doc here,

What kind of Carb is it? Q~Jet?

Doc
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