Fuel Pumps both dead
08-27-2017, 04:53 PM
#1
Fuel Pumps both dead Anyone have issues with electric fuel pumps not wanting turn over if they sit too long?
The Mallory 140 unit on my car started blowing fuses. Even after disconnecting the pump part the electric motor wouldn't turn under power until I first spun it by hand. Now after reassembly it seems to work again, but not sure I trust it.
Grab from my shed a 140 gph summit pump I used for awhile. Power it up and sounds like it is eating gravel. It was sitting for a couple of years with tape over the inlet/outlet. Pull it apart and lube the moving bits and now it works fine. Again, not sure I trust it.
Have a good prefilter on the car, no real debris in either pump.
What would you guys do? Put in one and carry the second as a spare? (Easy roadside swap on this car)
An Aeromotive SS 11203 pump is $208 at summit, about the price of a flipping tow. I know it has a stellar rep on this site, but do you think it will tolerate sitting unused better than the cheaper Mallory and Summit units?
The Mallory 140 unit on my car started blowing fuses. Even after disconnecting the pump part the electric motor wouldn't turn under power until I first spun it by hand. Now after reassembly it seems to work again, but not sure I trust it.
Grab from my shed a 140 gph summit pump I used for awhile. Power it up and sounds like it is eating gravel. It was sitting for a couple of years with tape over the inlet/outlet. Pull it apart and lube the moving bits and now it works fine. Again, not sure I trust it.
Have a good prefilter on the car, no real debris in either pump.
What would you guys do? Put in one and carry the second as a spare? (Easy roadside swap on this car)
An Aeromotive SS 11203 pump is $208 at summit, about the price of a flipping tow. I know it has a stellar rep on this site, but do you think it will tolerate sitting unused better than the cheaper Mallory and Summit units?
08-27-2017, 05:06 PM
#2
10 Second Club
How long a sit are we talking ?
Mine was in a body shop for 6 months and never started....came right on.
Motor swap over a few months, no issue, over winter no issue, ETC.
Aeromotive SS pump here.....
I would also ask how yours is mounted ? Some are picky
Mine was in a body shop for 6 months and never started....came right on.
Motor swap over a few months, no issue, over winter no issue, ETC.
Aeromotive SS pump here.....
I would also ask how yours is mounted ? Some are picky
08-28-2017, 06:02 AM
#3
I haven't driven the car much this last two years, but drove it a good bit just a couple of weeks ago. Installation is pretty text book, mounted motor up with the pump even with the bottom of the tank, 1/2" suction tube via a 100 micron prefilter, AN6 feed and return hard lines with a return style pressure regulator.
The pump on the car almost acted like there was a dead electrical connection. The one from the shed was just a little rusty inside. Shot it full of air tool oil to store it again.
I'll probably buy the Aeromotive pump. 140 gph is way too much pump but there aren't a lot of better options. I keep wanting to do an in tank pump to get the noise down. But I do have a chinee PWM controller I've been meaning to wire up. Now is the time I guess.
The pump on the car almost acted like there was a dead electrical connection. The one from the shed was just a little rusty inside. Shot it full of air tool oil to store it again.
I'll probably buy the Aeromotive pump. 140 gph is way too much pump but there aren't a lot of better options. I keep wanting to do an in tank pump to get the noise down. But I do have a chinee PWM controller I've been meaning to wire up. Now is the time I guess.
10-29-2017, 07:03 PM
#5
Got the aeromotive SS pump in and it is as loud as the old Mallory pump, maybe worse. I have the whole thing properly shock mounted, but it doesn't help that the car is so small with all the sound deadening tar removed.
The sound is almost a vibration that resonates through the whole car. Thought maybe it was a bad return regulator that was being amplified by hardline mounts that are too hard. I have the regulator mounted on the firewall so not good there. So did an experiment where I put a bypass hose in place of the regulator. No joy, still loud. Went one step further and removed the pump prefilter thinking there was some restriction. Just as loud. Decided to run a hose straight from the pump outlet to the car gas filler thereby bypassing all the car fuel lines.
Holy hell, this pump can move some fuel!! The gas came out like a fire hose. It actually pumped fuel faster than the fill tube could swallow it. Gas backed up the fill tube and started overflowing.
AND it was still Fing loud.
Guess I need to work on my PWM controller idea. 140 gph is a big *** pump. Way too big for a stock LS2 motor.
The sound is almost a vibration that resonates through the whole car. Thought maybe it was a bad return regulator that was being amplified by hardline mounts that are too hard. I have the regulator mounted on the firewall so not good there. So did an experiment where I put a bypass hose in place of the regulator. No joy, still loud. Went one step further and removed the pump prefilter thinking there was some restriction. Just as loud. Decided to run a hose straight from the pump outlet to the car gas filler thereby bypassing all the car fuel lines.
Holy hell, this pump can move some fuel!! The gas came out like a fire hose. It actually pumped fuel faster than the fill tube could swallow it. Gas backed up the fill tube and started overflowing.
AND it was still Fing loud.
Guess I need to work on my PWM controller idea. 140 gph is a big *** pump. Way too big for a stock LS2 motor.
11-02-2017, 11:45 AM
#7
Got the aeromotive SS pump in and it is as loud as the old Mallory pump, maybe worse. I have the whole thing properly shock mounted, but it doesn't help that the car is so small with all the sound deadening tar removed.
The sound is almost a vibration that resonates through the whole car. Thought maybe it was a bad return regulator that was being amplified by hardline mounts that are too hard. I have the regulator mounted on the firewall so not good there. So did an experiment where I put a bypass hose in place of the regulator. No joy, still loud. Went one step further and removed the pump prefilter thinking there was some restriction. Just as loud. Decided to run a hose straight from the pump outlet to the car gas filler thereby bypassing all the car fuel lines.
Holy hell, this pump can move some fuel!! The gas came out like a fire hose. It actually pumped fuel faster than the fill tube could swallow it. Gas backed up the fill tube and started overflowing.
AND it was still Fing loud.
Guess I need to work on my PWM controller idea. 140 gph is a big *** pump. Way too big for a stock LS2 motor.
The sound is almost a vibration that resonates through the whole car. Thought maybe it was a bad return regulator that was being amplified by hardline mounts that are too hard. I have the regulator mounted on the firewall so not good there. So did an experiment where I put a bypass hose in place of the regulator. No joy, still loud. Went one step further and removed the pump prefilter thinking there was some restriction. Just as loud. Decided to run a hose straight from the pump outlet to the car gas filler thereby bypassing all the car fuel lines.
Holy hell, this pump can move some fuel!! The gas came out like a fire hose. It actually pumped fuel faster than the fill tube could swallow it. Gas backed up the fill tube and started overflowing.
AND it was still Fing loud.
Guess I need to work on my PWM controller idea. 140 gph is a big *** pump. Way too big for a stock LS2 motor.
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01-27-2018, 03:24 PM
#8
This aeromotive pump is too damn much pump. It is too big for my AN6 return line.
Just spent 3 days getting douched in fuel trying to figure out why can't get the carb pressure below 8-9 PSI. When I couldn't adjust down the regulator though maybe it was clogged, so took all the guts out and STILL couldn't get the back pressure below 6-8 PSI. That led to bypassing the return line looking for restrictions. Looks like a return line consisting of 8 feet of 3/8 inch hard line won't move this pump's full flow. Have the same size supply line.
So anyone who runs this pump had better run 1/2 inch lines.
The PWM controller works like a champ to vary the pump speed. Going to be a bitch to run an isolated ground wire but that is what the controller needs. I'm going to wire it into a couple of switches so I have a two speed pump. Half to 3/4 speed allows the pressure regulator to hold 6 psi. But for reliability I want a bypass switch to put full power to the pump. That will mean 8-9 PSI minimum at the carb.
By the way, shock mounted the **** out of the thing and it is still stupid loud. Even disconnected from the car it is stupid loud.
Too much pump.
Just spent 3 days getting douched in fuel trying to figure out why can't get the carb pressure below 8-9 PSI. When I couldn't adjust down the regulator though maybe it was clogged, so took all the guts out and STILL couldn't get the back pressure below 6-8 PSI. That led to bypassing the return line looking for restrictions. Looks like a return line consisting of 8 feet of 3/8 inch hard line won't move this pump's full flow. Have the same size supply line.
So anyone who runs this pump had better run 1/2 inch lines.
The PWM controller works like a champ to vary the pump speed. Going to be a bitch to run an isolated ground wire but that is what the controller needs. I'm going to wire it into a couple of switches so I have a two speed pump. Half to 3/4 speed allows the pressure regulator to hold 6 psi. But for reliability I want a bypass switch to put full power to the pump. That will mean 8-9 PSI minimum at the carb.
By the way, shock mounted the **** out of the thing and it is still stupid loud. Even disconnected from the car it is stupid loud.
Too much pump.
01-31-2018, 04:42 AM
#10
10 Second Club
Run mine dead headed, but maybe it's my exhaust note making it not "so loud" ?
Old Holley pump was pretty bad though (forget if black or blue pump)
Old Holley pump was pretty bad though (forget if black or blue pump)
01-31-2018, 03:28 PM
#11
This aeromotive pump is too damn much pump. It is too big for my AN6 return line.
Just spent 3 days getting douched in fuel trying to figure out why can't get the carb pressure below 8-9 PSI. When I couldn't adjust down the regulator though maybe it was clogged, so took all the guts out and STILL couldn't get the back pressure below 6-8 PSI. That led to bypassing the return line looking for restrictions. Looks like a return line consisting of 8 feet of 3/8 inch hard line won't move this pump's full flow. Have the same size supply line.
So anyone who runs this pump had better run 1/2 inch lines.
The PWM controller works like a champ to vary the pump speed. Going to be a bitch to run an isolated ground wire but that is what the controller needs. I'm going to wire it into a couple of switches so I have a two speed pump. Half to 3/4 speed allows the pressure regulator to hold 6 psi. But for reliability I want a bypass switch to put full power to the pump. That will mean 8-9 PSI minimum at the carb.
By the way, shock mounted the **** out of the thing and it is still stupid loud. Even disconnected from the car it is stupid loud.
Too much pump.
Just spent 3 days getting douched in fuel trying to figure out why can't get the carb pressure below 8-9 PSI. When I couldn't adjust down the regulator though maybe it was clogged, so took all the guts out and STILL couldn't get the back pressure below 6-8 PSI. That led to bypassing the return line looking for restrictions. Looks like a return line consisting of 8 feet of 3/8 inch hard line won't move this pump's full flow. Have the same size supply line.
So anyone who runs this pump had better run 1/2 inch lines.
The PWM controller works like a champ to vary the pump speed. Going to be a bitch to run an isolated ground wire but that is what the controller needs. I'm going to wire it into a couple of switches so I have a two speed pump. Half to 3/4 speed allows the pressure regulator to hold 6 psi. But for reliability I want a bypass switch to put full power to the pump. That will mean 8-9 PSI minimum at the carb.
By the way, shock mounted the **** out of the thing and it is still stupid loud. Even disconnected from the car it is stupid loud.
Too much pump.
01-31-2018, 05:49 PM
#12
The Mallory pump had an internal bypass and somewhat adjustable internal pressure regulator. Aeromotive says messing with the internal pressure regulator violates the warranty.
But I can slow it down with the PWM controller.