97 GS, Fuel Pump Not Running

[sea-doin-it]

I have a 97 Grandsport.

Last winter the car would not start, it just cranked over.
I was told it was one of three things, Fuel Filter, CPS, or Fuel Pump.
I replaced the Fuel Filter for starters and didn't have any more problems.

Last weekend we hit a deer with this car, had to straighten the radiator support, replace a/c condensor & radiator. Soon will be replacing the bumper cover headlights and fog lights. Luckily no real damage to hood or fenders. After this the wife said it smoked, I told her it's probably antifreeze burning off after the radiator work? I checked all fluid levels and OK.

However this damage lead me do check out a lead from a former post about a fuel pump resistor behind the passenger headlight, I looked for this and couldn't find it?

Saturday morning the car wouldn't start, we had a really cold night, later that day it did start, I suspected a possible frozen fuel line and the tank was around a 1/4 tank. I added a bottle of Heat and filled the tank, drove it around for 20 minutes stoping and then starting with no problems, and didn't see any smoke as described by the wife. Sunday morning it wouldn't start again. I tried a few times that day and nothing. Later that night it started only to run for 3-4 seconds and then die.

I do not hear the fuel pump come on for the 2-3 seconds when the ignition is turned to the run position. I was told to use a rubber mallet to bang on the tank some and see if this jars the pump into running, still nothing. I want to check this resitor if it does exist on my Regal, and I want to check voltage at the fuel pump, any help guys? I have the rear seat removed and can see a three wire lead to the tank assembly, how can I check voltage (schematic). I can not say if it's good or not and want to check.

Also, the fuel level gauge has not worked since we got the car two years ago. And the car has had some intermittent electrical problems which is why I want to check before buying a $500 dollar pump/level assembly.

[sea-doin-it]

Update:

I have also checked the fuel rail at the engine and do not have fuel pressure.
I have also found the fuel pump resistor threads. I tried the bypass resistor to put the fuel pump on high (bend tab on relay #15) and it did NOT work, still no fuel pump action.

Does anyone know what voltage I should get on what wire at the fuel pump?

[BNaylor]

With the resistor bypassed a close to 12 volts using a mulitmeter (DMM). Just pull the electrical connector at the fuel pump assembly (top) and prod with test prods. Gray or red wire rings a bell. Use chassis ground for ground.

Also, did you swap the fuel pump relay with the fuel pimp speed control relay?

[sea-doin-it]

BNaylor,

With the resistor bypassed it still didn't work. I tested both relays and they are fine. I then went down to the main library and they had the GM Shop manual on the shelf, after much digging I found the schematic to tell me it's the grey wire to the black. I disconnected the wiring harness and checked voltage at the pump while my wife turned the key to "run", it read 11V for about three to four seconds and shut off.

So, I have found that my fuel pump is shot, got a new one on order...

The GMC Shop manual didn't say what voltage to get, it only said something like "a higher voltage will increase the pump speed". So I guess 11V is low and 12V is high. Also, the Shop manual didn't say how many Ohms the Fuel Pump Resistor should measure at, do you know?

TY for the help

[BNaylor]

Originally Posted by sea-doin-it

. Also, the Shop manual didn't say how many Ohms the Fuel Pump Resistor should measure at, do you know?

It doesn't sound like the fuel pump resistor based on your symptoms and seeing how you found the fuel pump bad so I wouldn't worry about what the resistance is. Good luck and let us know how it turns out.

[sea-doin-it]

Replaced fuel pump, runs great. Except now other problems have reared their head again but need to read existing threads on HVAC and Drivers Side Temperature Actuator, etc. Although I think I need to replace the Climate Control Head Unit.