Tech / General EngineIs your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
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Anyone know the volume (GPH) of the 1984 LG4 stock fuel pump and when it becomes a performance obstacle?
I have a 355 making around 325 HP and need to know if I should upgrade.
If yes what should we do with the fuel return line outlet (coming out of the stock pump - the one not going to the carb) if the performance pumps available do not have that outlet?
The in-tank electric pump is known good to 308 crank HP as proven on an engine dyno. If you're running that, then don't bother with another pump on the block, just get a return-style fuel pressure regulator set to about 5.5 psi. If the pump in the tank fails, having one on the block won't save you, since it can't pull fuel through a failed electric pump in the tank.
If you don't have an in-tank pump, which you may not (at least my 85 IROC doesn't have one), you might consider the following. According to five7kid, the Carter M6626 is a good choice for the mechanical. It has the return line, and is rated for 120 GPH.
BTW, I'm running an off-the-shelf pump on my 350/330 with no noticeable problems.
JamesC
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