GM fuel pump modules

[CFI]

After my recent problem with my fuel pump I’m considering using a readily available GM unit. I know there are several members using them. My question is: has anyone found a GM fuel pump module (pump and sender) that requires little to no modification to work? IE correct size for the fuel tank opening, correct pressure, flow, etc. I’m not worried about fuel sender accuracy.

[Patrick C]

When my DMCH all-in-one pump stopped putting out enough pressure last summer, I installed this one:

Spectra Premium SP6170M Fuel Pump Module for Chevrolet/GMC https://www.amazon.com/dp/B000IYQJUS/ref=cm_sw_r_cp_tai_3c2SCbDDESEHD

It did need to have the black fuel pressure sensor on the top removed (pops off) and plugged with a bolt, and I filed down the tabs around where that sensor was. I also had to trim the plastic tab off the side of the pump. I am using Hervey’s fuel sender now, as the float was reversed on this one.

[CFI]

When my DMCH all-in-one pump stopped putting out enough pressure last summer, I installed this one:

Spectra Premium SP6170M Fuel Pump Module for Chevrolet/GMC https://www.amazon.com/dp/B000IYQJUS/ref=cm_sw_r_cp_tai_3c2SCbDDESEHD

It did need to have the black fuel pressure sensor on the top removed (pops off) and plugged with a bolt, and I filed down the tabs around where that sensor was. I also had to trim the plastic tab off the side of the pump. I am using Hervey’s fuel sender now, as the float was reversed on this one.

Good stuff, thank you. FYI I did a little digging and found out that SP6149M is the same pump minus the pressure sensor.

[Patrick C]

Good stuff, thank you. FYI I did a little digging and found out that SP6149M is the same pump minus the pressure sensor.

Nice find. From the photos in the listing below, it still looks like you would need to file away the plastic tabs where the sensor would have been, if you want the infill panel to seat over it.

Spectra Premium SP6149M Fuel Pump Module for Chevrolet/GMC https://www.amazon.com/dp/B000C7W3CE/ref=cm_sw_r_cp_tai_Ao5SCbNK9YX4K

[CFI]

Nice find. From the photos in the listing below, it still looks like you would need to file away the plastic tabs where the sensor would have been, if you want the infill panel to seat over it.

Spectra Premium SP6149M Fuel Pump Module for Chevrolet/GMC https://www.amazon.com/dp/B000C7W3CE/ref=cm_sw_r_cp_tai_Ao5SCbNK9YX4K

Yes I did notice that. Too bad, I was hoping the tabs wouldn’t be there. I’m leaning towards a Delphi unit, FG0089. Advance Auto has them. I really like the idea of picking one up locally for warranty purposes.

[Patrick C]

I’m leaning towards a Delphi unit, FG0089. Advance Auto has them. I really like the idea of picking one up locally for warranty purposes.

It looks like that is only rated for 62 psi though.

https://www.carid.com/delphi/oe-fuel-pump-module-assembly-mpn-fg0089.html

[Bitsyncmaster]

It looks like that is only rated for 62 psi though.

https://www.carid.com/delphi/oe-fuel-pump-module-assembly-mpn-fg0089.html

Funny it says max pressure is 109 PSI. I'm guessing the 32 GPH is at the 62 PSI.

[CFI]

Funny it says max pressure is 109 PSI. I'm guessing the 32 GPH is at the 62 PSI.

Will the PPR bump this up?

[Chris 16409]

I have been using the AC Delco MU1777. You can get it at AutoZone for about $170. It has a lifetime warranty. It's also made in Mexico (usually) which is better than China. It has been working good.

https://www.autozone.com/external-engine/fuel-pump/acdelco-fuel-pump/963547_603616_1562?&searchText=mu1777

[Patrick C]

Funny it says max pressure is 109 PSI. I'm guessing the 32 GPH is at the 62 PSI.

Interesting. The SP6170M pump I am running is minimum 72.5 psi and maximum 130.5.

[Bitsyncmaster]

Will the PPR bump this up?

Yes the PPR is what sets the pump pressure. As far as I know none of the fuel pumps have any kind of pressure regulator in them. As long as the max pressure specification is above what your PPR is set to I would assume that pump will work for you. The flow rates of these pumps is way higher than a PRV engine would require.

[CFI]

Yes the PPR is what sets the pump pressure. As far as I know none of the fuel pumps have any kind of pressure regulator in them. As long as the max pressure specification is above what your PPR is set to I would assume that pump will work for you. The flow rates of these pumps is way higher than a PRV engine would require.

Ok that’s what I was thinking. Thanks.

[CFI]

I have been using the AC Delco MU1777. You can get it at AutoZone for about $170. It has a lifetime warranty. It's also made in Mexico (usually) which is better than China. It has been working good.

https://www.autozone.com/external-engine/fuel-pump/acdelco-fuel-pump/963547_603616_1562?&searchText=mu1777

Good. I may just go with this one, as it’s in stock down the road from me. Thanks.

[CFI]

Here is the connector that came with my module. Can someone tell me which wires are for the pump? I don’t plan on connecting the sending unit at this time.

59713

[Bitsyncmaster]

Here is the connector that came with my module. Can someone tell me which wires are for the pump? I don’t plan on connecting the sending unit at this time.

59713

Assuming all the pumps with that connector are the same. Mine the far right pin as you have pictured is +12 volts and the far left is GND.
The center two pins are the sender. I'm not sure all the GM pumps are wired the same though.

[Josh]

The heavier wires are for the pump, the thinner wires are for the sender. Lots of pinouts on google.

As for the pressure, it is likely an error in the specification documentation. All these integrated GM pumps are putting out an excess of 100PSI before they are regulated down.

[dmcnc]

I would verify with the pump itself as those pumps are not all wired the same despite using the same connector.

[CFI]

The heavier wires are for the pump, the thinner wires are for the sender. Lots of pinouts on google.

As for the pressure, it is likely an error in the specification documentation. All these integrated GM pumps are putting out an excess of 100PSI before they are regulated down.

Cool, thanks

[CFI]

I would verify with the pump itself as those pumps are not all wired the same despite using the same connector.

It’s crazy, the wire colors on the module are totally different than the ones on the connector. In fact, the module wires change to a different color after passing trough the top piece. :shock:

[dmcnc]

You usually can see the + and - sides on the pump itself. I used the multimeter on one and tested the connector on the top of the module to figure the power pins. The other two are for you sender sensor. I wouldn't trust the color convention. Also swap the higher gauge wires to match your pump pins if your connector happens to be different.


It’s crazy, the wire colors on the module are totally different than the ones on the connector. In fact, the module wires change to a different color after passing trough the top piece. :shock:

[Bitsyncmaster]

You usually can see the + and - sides on the pump itself. I used the multimeter on one and tested the connector on the top of the module to figure the power pins. The other two are for you sender sensor. I wouldn't trust the color convention. Also swap the higher gauge wires to match your pump pins if your connector happens to be different.

+1
The side that plugs into the pump the cap pulls off and then you can release the pins and move the wired pins to other locations. I was not sure which pump wire was +12 and which was ground. I guessed correct but tested with it reversed anyway and no fuel flowed reversed.

[CFI]

Well I’m happy to report that after putting this off for months I finally installed a GM fuel pump module. I decided to go with a Delphi FG0089 unit. It’s readily available at most parts stores or your favorite online retailer. It works just fine. I took my time and still had it finished in less than 1.5 hours.

I’m not sure what kind of check valve is installed in it but I am able to restart the engine immediately after shutting it off, and after letting it sit for 1 hour. I’ll report back if I notice any problems with it holding pressure for longer than that but since I have Dave’s solid state RPM relay that primes the system every now and then I don’t think I’ll have any problems with resting pressure.

For those that choose to go with a Delphi FG0089: There was a small plastic tab on the top side that needed to be sanded off in order to fit the v band clamp but that was the only modification required. This particular unit does not come with a pressure sensor but it does have the tabs that hold one in place. Those tabs are currently in the way of the fuel pump cover plate so eventually I’ll have to come up with a solution to that (perhaps sand those off too).

[Ron]

You mentioned a missing pressure sensor. Can you tell me what one is normally used for?

[CFI]

You mentioned a missing pressure sensor. Can you tell me what one is normally used for?

On newer vehicles a pressure sensor is used to detect the absense of pressure in the tank, ie a vapor leak (or worse). It will trigger a Check Engine Light. It’s similar to the pressure sensor on the fuel filler neck on newer vehicles that will set a Check Engine Light if the gas cap is not tightened correctly or missing.

The DeLorean needs no such sensor. The GM modules are available with and without the sensor.

[Bitsyncmaster]

On newer vehicles a pressure sensor is used to detect the absense of pressure in the tank, ie a vapor leak (or worse). It will trigger a Check Engine Light. It’s similar to the pressure sensor on the fuel filler neck on newer vehicles that will set a Check Engine Light if the gas cap is not tightened correctly or missing.

The DeLorean needs no such sensor. The GM modules are available with and without the sensor.

I think my 2018 Camry also checks for pressure build up. Every so often I hear a pump running many hours after a drive and i hear the pump near the fuel tank. I checked the internet about that pump noise and it is normal. Next time I hear it I will remove the fuel cap and see if that turns the pump off.

[CFI]

I think my 2018 Camry also checks for pressure build up. Every so often I hear a pump running many hours after a drive and i hear the pump near the fuel tank. I checked the internet about that pump noise and it is normal. Next time I hear it I will remove the fuel cap and see if that turns the pump off.

I believe some vehicles periodically run an air pump to verify pressure in various fuel system components. A bad reading won’t necessarily trigger a Check Engine Light. It’s usually a series of bad readings over a set time that will do it. I’m not sure what removing your cap will do, other than trigger 1 bad reading that will get stored in the ECU.

[Bitsyncmaster]

I believe some vehicles periodically run an air pump to verify pressure in various fuel system components. A bad reading won’t necessarily trigger a Check Engine Light. It’s usually a series of bad readings over a set time that will do it. I’m not sure what removing your cap will do, other than trigger 1 bad reading that will get stored in the ECU.

I will have to look into it some more. The car has been off for many hours and a pump noise will start and run for quite some time. I would think it has something to do with not venting gas fumes.

[CFI]

I will have to look into it some more. The car has been off for many hours and a pump noise will start and run for quite some time. I would think it has something to do with not venting gas fumes.

I'm sure that's what it is. Checking for evap system leaks.

[Josh]

the pressure sensor is a critical component to the EVAP system. It triggers the charcoal canister vent valve to open, the purge valve, as well as detecting large and small leaks in the vent side of the fuel system.
Without it the evap system does not function.

I just completed a LS swap in 2022, which retained the full evap system. I had to leave the pressure sensor in the fuel pump and tie it into the ecu

[Ron]

Are you sure it is not a valve? I know that later vehicles will periodically wait until you are in closed loop and driving 45+ MPH (iirc) constantly. It then applies vacuum to the tank, shuts a valve, waits a period of time then checks to see if the tank is still under vacuum. If not it will throw an OBDII emission code (E.G. P0457, leak in EVAP system). (Similar to what Josh posted.)
Never had to find out where the valve is located since it has always been a bad cap (95%) or a line off of the engine was damaged etc...

If it's a pressure sensor, I'd be interested in using the assembly for a non-automotive project. Possibly use the sensor to feed a shutoff, depending on its output....


EDIT: OK, after rereading all, I guess it is the part (sensor) that checks to see if the vacuum is still in the tank and/or triggers the valve at the canister Josh spoke of.

[Bitsyncmaster]

This got off topic but here is a good articular on the EVAP system in the Camry. Interesting they put the fuel pump pressure regulator in with the fuel pump so no return line is needed.

https://www.autoserviceprofessional.com/article/95428/camry-generations-five-and-six-a-brief-tour-of-the-toyota-camry-fuel-and-evap-systems

[Chris 16409]

I looked up Delphi FG0089 on RockAuto. It's says the max pressure is 109 PSI. I've been using the ACDelco MU1777 which looks like the same pump. Both are from a 1999 Chevy Tahoe.