Fuel Pressure Regulator

[racephotoman]

I just installed my 347 engine....got it running in the garage at least....any reason/advantage why you should use a Fuel Pressure Regulator? I seem to be falling into the upgrade trap and need to get out.

Walter

[FFRSpec72]

Only if you need more/less fuel pressure than the stock regulator. What is your Air/Fuel ratio as that may decide if you need one or not.

[Mustang Man]

Need more details...

Presume carb, but if not then EFI? If carb'd is it an electric pump (brand?) or a mechanical?

If an on-engine mechanical you probably dont' need a regulator, but some electric pumps can "creep" on the pressure. Do you have a gauge on the carb's feed line?

Mark

[tcoon]

Most racers run an adjustable regulator on the fuel rail for EFI engines. This allows you to fine tune your mixture to avoid a lean condition these engines are notorious for if you are running anything other than stock airbox, exhaust, etc. (you have a 347, right?) Stock A9L will run lean with a stock regulator and could grenade your engine. Use an adjustable fuel regulator, then do a dyno tune to see where you stand. You may also require a tuner chip on the computer to keep your air fuel ratio in the safe range, depending on other mods in your engine (cam, heads, injectors, MAF, etc,etc). Fuel regulator is the cheapest part on the engine!

[Mesa Mike]

What "tycoon" said. The A9L caused my modified 5.0 to run lean. Installed the regulator to make sure I had the correct fuel pressure for my 24lb injectors.

[racephotoman]

Yes, it's a carb 347ci engine with the fuel pump mount directly on the engine....Presently I don't have any gauges in the fuel line, too I was just wondering since I see the regulators available. I also just started the engine to see if all the gauges, pressures etc. were working - haven't move the car off the blocks yet. I purchased the motor from Engine Factory and they said it's basically it's a turn-key -which it seems to be - again, just wondering about the merits of the extra gauging. Thanks

Walter

[Mustang Man]

I would at least buy a basic fuel pressure gauge (0-15psi for carb) and install it in the dual feed line (most have an 1/8-inch NPT port for just such an addition) so you can see what your pump is providing the carb.

HTH...
Mark

[Dan Babb]

I'd put a gauge on the fuel line before the carb just to make sure. It's not a big investment.

If/When you do get it dynoed, it would help them to see the pressure reading as the engine is going through the RPM range. If your pump is over spec, the FPR will help keep it in the right range.

[SRAMA]

Years ago I had a sbc 283 with a holley four barrel. Would never idel properly, would occasionally stall at a light, I would jump out and look in the card and it would be dripping raw fuel and idling terribly. Put on a fuel pressure regulator and "poof" all the problem went away. In hindsight it would appear obvious that too much pressure pushed fuel past the needel and seat leading to all kinds of problems.
One of the biggest problems now days would be to find someone who remembers how to set up a carb "for the street".

STEVE

[riptide motorsport]

regulaters are inexspensive but very useful.....i would install one....$40, not alot of $.