http://www.summitracing.com/parts/sum-g3032/overview/

http://www.summitracing.com/parts/sum-800115/overview/

I have a 351 Cleveland, with a 1405 Edelbrock carburator. It was flooding because there was too much fuel pressure coming from the stock fuel pump. I put on the summit gauage and regulator. The regulator is set for 6.5 pounds in the factory.

The truck started with 10 pounds and turning it counter clockwise I can't get it to stay under 6 pounds. Another day I started it and ran it and it was a 2 pounds.

Has anyone seen this problem before?

 

Have not seen that problem, but this info mght help?

Ford 351M and 400 fuel pumps put out about 7 psi if "spot on".

Holley and Motorcraft Carbs can take in excess of 7 psi due to longer float arms with large floats. Carter AFB & AVS & Edelbrock carbs have shorter float arms which is in part why they are more compact, and smaller floats and they are less tollerant of higher fuel pressures, 6 psi is the max that Edelbrock recommends for their carbs which are copies of the Carter carbs. They recommend that a max pressure used at 5.5 psi. High fuel pressure does not mean more power as many cars we considered as muscle cars used 4-6 psi.

You likely need a decent Fuel Pressure Regulator like Holley's # 12-803 and use a fuel pressure tester in a tee between the carb and FPR to set pressure at 5.5 max. Do not waste money on a Spectre or Mr Gasket FPR. Once set you can remove the tee and tester.

 

Are you saying the 6.5-PSI regulator output varies between 2 and 10 PSI? Sounds like a bad regulator. Or are you saying something else?

 

I fixed it by putting replacing the 5/16 line with a 3/8 line, and it dropped the pressure and the regulator worked fine. Thank you all.

 

Actually the bigger line did not fix the problem. The problem later came back.

When I start it, often it has 10 psi of fuel pressure. I then heat up the truck a bit, shut it off and it will be at 5 psi or the setting I have selected. When the truck is running a while, it will be like 3 psi.

I replaced the regulator above, and still the same problem.

At anytime I can adjust the pressure up or down, but at different times the gauage shows different pressure. It is the summit 3032 regulator with their liquid gauage.

Any suggestions?

 

Does the gauge have a vent on it? my drag car has the Auto Meter liquid filled fuel pressure gauge on the hood, every once in a while I need to crack the vent screw on top, otherwise the gauge reads wrong

 

The gauge does not have a vent.