FUEL PUMP, OR FUEL PRESSURE REGULATOR

1994 Ford Ranger

Tiny

ASEMaster6371

August, 26, 2012 AT 8:06 PM

The regulator is fine. When you decrease manifold vacuum, the pressure increases.

The pressure is on the low side. I like to see around 35 at idle with the vacuum line on the regulator

Roy

Tiny

Craig jaster

August, 26, 2012 AT 8:23 PM

Ok, I took it for a test drive and its still bogging down under a load, not as bad but still is. When you throttle the engine doesnt that give you more vacuum?
The pump should be more than enough to provide adequate pressure to the rail. The specs on the pump call for minimum of 80 psi and max 100 psi. Unless I got a bad pump which has happened before.

Tiny

ASEMaster6371

August, 26, 2012 AT 8:26 PM

No, less vacuum under load. Yes, you could have a bad new pump. Airtex is a good pump but you never know.

Roy

Tiny

Craig jaster

August, 26, 2012 AT 8:27 PM

Regardless of the rpms of the engine, an electronic fuel pump is going to continuously give you the same pressure, and the regulator is going to adjust the pressure into spec right?

Tiny

Craig jaster

August, 26, 2012 AT 8:32 PM

The only things on the fuel system that arent new as of today are injectors, fuel rail, lines and filter. The filter is the only thing left that would cause loss of fuel pressure

Tiny

ASEMaster6371

August, 26, 2012 AT 8:35 PM

Nope, wont do it. There is a bypass if the filter gets clogged.

Roy

Tiny

Craig jaster

August, 26, 2012 AT 8:52 PM

Ok, so less manifold vacuum increases the fuel pressure right, so does that mean I have too much manifold vacuum at idle?
How does manifold vacuum get too high there are any vacuum regulators anywhere, I cant find any. Could that mean I have a vacuum clogged somewhere? An open vacuum line would reduce vacuum elsewhere or could my idle be set too high? Im stumped here. Could the throttle position sensor cause this?

Tiny

ASEMaster6371

August, 26, 2012 AT 9:11 PM

You vacuum is fine, your regulator is fine. There is no vacuum issue. It is a pressure issue possibly from a weak new pump.
Roy

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