By factory design, the passenger's side "jet pump" keeps the driver's side fuel tank full at all times. This would mean that the passenger's side fuel tank runs out before the driver's side right?

Question:
What would happen if the fuel tanks were connected at the bottom and therefore always remained equal (left and right went down even)? Would this cause the fuel gauge to freak out?

Reason I'm asking is I read where a guy was talking about connecting the two tanks at the bottom and putting an active (normal) fuel pump in the passenger's side tank to make a duel pump (higher flow) setup. It sounded like his setup was not using the factory gauges so he didn't mention anything about how the gauges would respond, but this made me wonder what the fuel gauge would do in such a situation.

 

You would get the following DTC:

DTC P2066
Circuit Description
The right/secondary fuel level sensor measures fuel level changes within the right/secondary fuel tank. When the fuel level is high the sensor signal voltage is high. When the fuel level is low the sensor signal voltage is low.

The powertrain control module (PCM) uses inputs from the left/primary fuel level sensor and the right/secondary fuel level sensors in order to calculate the total fuel remaining in both fuel tanks. The PCM sends this information via class 2 to the IPC.

This diagnostic tests for a stuck right/secondary fuel level sensor signal. If the PCM determines that the fuel level (right tank) signal appears to be stuck based on a lack of signal variation expected during normal operation, this DTC sets.

Conditions for Running the DTC
The engine is operating.

Conditions for Setting the DTC
• The right/secondary fuel tank is not empty.
• More than 241 km (150 mi) have been accumulated.
• The PCM does not detect that the fuel level in the right/secondary fuel tank has not changed by at least 3.0 liters (0.80 gallons).

OR

• The right/secondary fuel tank is not empty.
• The left/primary fuel tank is not full.
• Engine operating greater than 40 minutes.
• The left/primary fuel tank does not achieve the top of its range. Observe, after operating the engine for greater than 40 minutes the fuel in the right/secondary fuel tank will transfer to the left/primary fuel tank.

OR

• The right/secondary fuel tank is empty.
• The left/primary fuel tank is full.
• The fuel level in both fuel tanks does not change after traveling more than 284 km (200 mi). Observe, if the right/secondary fuel tank is empty, the left/primary fuel level should decrease after 284 km (200 mi).

Action Taken When the DTC Sets
• The PCM stores the DTC information into memory when the diagnostic runs and fails.

• The malfunction indicator lamp (MIL) will not illuminate.
• The PCM records the operating conditions at the time the diagnostic fails. The PCM stores this information in the Failure Records.
• The vehicle fuel gage displays empty.
• The check gages indicator illuminates.
• The driver information center displays the LOW FUEL message.

Conditions for Clearing the MIL or DTC
• A history DTC will clear after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
• A last test failed, ore current DTC, will clear when the diagnostic runs and does not fail.
• Use a scan tool in order to clear the MIL or DTC.

Based on your description the second set of circumstances would probably set the DTC.

By the way connecting the bottom of both tanks through some sort of plumbing is non trivial. Probably why GM didn't do it.

Bill

 

By factory design, the passenger's side "jet pump" keeps the driver's side fuel tank full at all times. This would mean that the passenger's side fuel tank runs out before the driver's side right?

Correct


Reason I'm asking is I read where a guy was talking about connecting the two tanks at the bottom and putting an active (normal) fuel pump in the passenger's side tank to make a duel pump (higher flow) setup. It sounded like his setup was not using the factory gauges so he didn't mention anything about how the gauges would respond, but this made me wonder what the fuel gauge would do in such a situation

If the original fuel level sensors where still installed and reporting L/R Tank Fuel Levels to the PCM, than the fuel gauge would drop to ZERO and the activate CHECK GAUGES and Warning Chimes

Both left and right fuel level senders are independent reports to the PCM, as this reporting ensures that the fuel is transferring from the right fuel tank to the left fuel tank (at the proper transfer rate).
For Details on the sensor reporting and transfer rates, Check out my posting (number 3) in the thread ling below for a 1999 model year.
https://www.corvetteforum.com/forums...nder-says.html


Cheers,
GOOSE

 

Link no work

 

Link here https://www.corvetteforum.com/forums...nder-says.html