What I'm asking is can you hard wire your fuel pump to be controlled by a switch you turn ON before you start the engine and just turn OFF before you kill it, and it still be drivin on a dally basis? The reason I ask is because my 85 tpi is burning up fuel pumps, they'll last for about a week then slowly decrease in pressure until it will just idle and rev in neutral but once you put it in drive and get a load on it all it will do is idle down the road if you touch the throttle it will die. I've searched and searched and haven't found anything that will fix my problem, the FP fuse is good, the relay is good, the oil pressure sending unit is sending power to FP, 2 new fuel filters, new fuel regulator, new connectors to FP and my return line is flowing good so that's not burning it up.
I'm just done messing with this thing, is there any way to hard wire the FP and it be dependable, does the flow of the FP vary while running or does it just keep the same pressure throughout and the extra just get returned to the tank?

 

Can you? Yea.

Should you? No.

I mean no offense but that is a halfassed fix if I have ever heard of one.

 

sounds like you need to fix the real issue, that might be a fuel regulator or one of the sensors, possibly even the ecm?

 

Have you put a FP gauge on the fuel rail to see whats going on?

 

If the fuel pumps are going out, hardwiring them won't make a difference. If they are not getting adequate current, then it will.

 

Fuel pressure is controlled by manifold vacuum. The lower the vacuum the higher the fuel pressure, based on the fuel pressure regulator of course. Some guys remove the vacuum hose from the regulator and plug the vacuum source. That eliminates the vacuum control and the pressure remains at the higher level.

Stock fuel pressure regulators do vary in the amount of fuel pressure they allow though. Latest numbers I've seen and the ones in my 96 Facgtoruy Service Manual showed 41-47 psi as the range. My stock regulator allowed 46 psi but my son's, who also has a 96 Vette, checked at 43 psi.

Jake

 

Could have a blockage in the fuel feedline. Have you done a flowtest by removing the feedline at the fuel rail,connecting a rubber fuel line with container and turning the pump on to measure the flow rate?

 

Remove the Gas Door Once More,

Connect a Voltmeter across the Fuel Pump Wires - The GRAY & BLACK WIRES. YOU NEED TO BACK PROBE THE WEATHER PACK CONNECTOR WITH SOME PAPER CLIPS UNFOLDED OR SOME "T" PINS. LEAVE THE FUEL PUMP CONNECTED TO BODY HARNESS.

GRAY WIRE TO THE RED LEAD OF THE VOLTMETER

BLACK WIRE TO THE BLACK LEAD OF THE VOLTMETER.

SET YOUR VOLTMETER TO DC RANGE AND AUTO RANGE OR TO MEASURE AT LEAST 20VDC.

START THE CAR AND LET IT RUN. NOTE THE VOLTMETER READING.

YOU SHOULD HAVE AROUND 13.5VDC. MIGHT BE HIGH AS 14.5VDC.

THEN MEASURE THE BATTERY VOLTAGE DIRECTLY ACROSS THE BATTERY TERMINALS WITH THE CAR RUNNING YET.

SUBTRACT THE TWO VOLTAGE READINGS. IF YOU SEE A VOLTAGE DROP HIGHER THAN 1.0 - 1.25VDC, THEN THERE IS A POWER FEED PROBLEM. THE GM FUEL PUMP WIRING IS PRETTY THIN - 16 GAUGE.
GOING TO SEE A VOLTAGE DROP OF .50 - 1.0 VDC.

A BAD FUEL PUMP RELAY WITH BURNT CONTACTS, BAD TERMINAL, BAD TERMINAL CRIMP CONNECTION, BAD FUSEABLE POWER LINK TO THE FUEL PUMP CIRCUIT, BAD GROUND CIRCUIT WILL ALL CAUSE A EXCESSIVE VOLTAGE DROP.

BEST TO ISOLATE EXACTLY WHATS CAUSING THE FUEL PUMPS TO REPEATLY FAIL.

EXCESSIVE VOLTAGE DROPS IN A FUEL PUMP CIRCUIT CAUSES IT TO BURN UP FUEL PUMPS AND ASSOCIATED WIRING IN A HURRY.

BR

 

Sure you can. Race cars, those that are PURE race cars, have the FP wired that way all the time.

Whether you SHOULD do it is another matter though. NO YOU SHOULDN'T. Safety issues and it'll only be a matter of time before you forget and leave it on.

Jake

 

Like Jake says............. Don't Hardwire Your Corvettes Electric in tank fuel pump.

Not a good idea if driving on the street.

In accident, you may be knocked unconscious.

LIKE BEING BROADSIDED OR BAD HIT TO THE FRONT OF YOUR CORVETTE.

The engine running or not running..........

and the fuel feed line or fuel return line cracked, and spraying 35-40PSI gasoline allover onto the hot exaughst parts.

A raging fire that will keep burning because the electric fuel pump is still on and not switched manually off.

You and your Corvette will burn to the ground in a hurry.

I have seen some pretty bad accident aftermaths throughout the years working as an auto mechanic and working on dirt track cars and drag race cars.

Gasoline fires are very bad and rage into a huge ball of fire in no time.

If you dont believe that and think I am full of BS,

then talk To ARNIE BESWICK THE FARMER.

HE ESCAPED NARROWLY FROM A SEVERE GASOILE FIRE IN HIS 6-SECOND PONTIAC DRAG CAR AROUND 2005.

CRACKED AN FUEL FITTING SPAYED GASOLINE ALLOVER HIS UPPER BODY AND BURNT THROUGH HIS RACING SUIT AND NOMEX UNDERCLOTHING.

HE IS OK TODAY BUT BEARS SCARS FROM HIS FIRE ACCIDENT.

Met him several times prior to the accident and one time afterwards during his recovery.

QUITE THE MAN TO TALK TO ARNIE BESWICK. AND I ADMIRE TO THIS DAY. HAS EARNED THE TITLE "MR. PONTIAC".