Fuel presure way to high????

[starfire350]

Ok I have a BG400 pump with 10an coming from the fuel cell. the regulator nut on the pump is backed off counter clockwise as far as it can go without leaking it has a 8an return on top of it going back to the cell. Then 10an all the way to a aeromotive 1000 boost referenced regulator witch has a an8 return line back to the cell then an6 to the carb where there is also a liquid filled fuel gauge. the regulator is backed all the way off and I cant get the presure to the carb under 14 pounds, and that is causing me obvious problems.

What can I do or what have I done wrong I just checked BG web site and instalation instructions to be sure I was plumed right and did the same with Aeromotive web site. I just dont get it.... any help would be greatly appritiated as I am tired of pulling out my hair.

 

[DFWMalibu]

is the regulator a carb regulator or an efi regulator.....

Chris K.

 

[starfire350]

it is listed by aeromotive as a "perfect regulator for a blow through aplication" it also says for efi

 

[DFWMalibu]

I am betting that is the problem.... I have had a rising rate regulator for efi and they don't go very low because most typical efi motors run in the 40psi area........

Chris K

 

[ProJunk]

You need to be using one of two Aeromotive regulators for blow-through use... either #13204, or #13202. If you have any other regulator than that, then you have the wrong regulator. You should really have the 13202 if you're using a BG400. The 13202 has a much larger return orifice inside to help return the necessary amount of fuel with a large pump like the BG400. You also need to cap the bypass on the pump and install a minimum of a -10AN return line for your fuel system to function properly in a blow-through application. You can't have too big of a return line, but if you go too small, then you won't be able to return a high enough volume of fuel when the engine has low fuel demand and pressure will back up in the fuel system.

 

[starfire350]

I have the 13204 on it now. After reading some more on it it says it can handle up to 150 gallons per hour. My pump show to produce up to 400 so I guess it cant return enough.??... The 1302 does say it can handle any high volume electric pump. I guess I will get a 1302 and try it.

Why cap the bypass on the pump?

 

[ProJunk]

Only one return line is necessary in a return-style fuel system. By blocking the bypass at the pump, you insure that the entire volume & pressure output of the fuel pump is available at the regulator. The 13204 definetely will not keep up with a BG400. The 13202 should solve your problems, but you HAVE to install a minimum -10 AN return line. If you have to purchase hose & fittings, I would just go to -12 AN and be done with it, as it won't cost much more, and you can't have too big of a return line. Your current -8 AN return line will not keep up with the flow of the fuel system.