Mallory Fuel Pump Issue
#1
Mallory Fuel Pump Issue
I posted this in another forum but I think this is the proper place! Sorry. Car is 79 Rx7.
I installed a Mallory 4070M today in a horizontal position basically where the stock fuel pump was. I turned on the ignition and low and behold fuel was flowing to the line in the engine bay (into a jar).
About 15 mins later I tightened everything up and this time there is no hum of the pump and no flow. The pump also gets hot after a few minutes.
It was suggested that I might have a bad ground or pump so I undid the wiring and put the pump directly on a 12V lantern battery. Again, no flow.
I've noticed from other installs that the pump is often vertically mounted. Did I somehow fry the pump???? Could I simply have a bad pump?
TIA
I installed a Mallory 4070M today in a horizontal position basically where the stock fuel pump was. I turned on the ignition and low and behold fuel was flowing to the line in the engine bay (into a jar).
About 15 mins later I tightened everything up and this time there is no hum of the pump and no flow. The pump also gets hot after a few minutes.
It was suggested that I might have a bad ground or pump so I undid the wiring and put the pump directly on a 12V lantern battery. Again, no flow.
I've noticed from other installs that the pump is often vertically mounted. Did I somehow fry the pump???? Could I simply have a bad pump?
TIA
#3
I unmounted the fuel pump and tested it on the bench and sure enough it doesn't work.
I called RB who asked me to call Mallory (now part of MSD). I explained the situation to Mallory and their guess is that it's a defective unit and will be covered by warranty. So I packed up the pump and sent it off to them.
I called RB who asked me to call Mallory (now part of MSD). I explained the situation to Mallory and their guess is that it's a defective unit and will be covered by warranty. So I packed up the pump and sent it off to them.
#6
Rotary Freak
iTrader: (1)
The pump mechanism on those is very sensitive to how tight the screws are torqued. I had one seize on me, and the tech rep told me to back off the screws some. I did what he said, and it worked fine.
It resolved the problem, but I my opinion, that's not a very robust design.
It resolved the problem, but I my opinion, that's not a very robust design.
#7
The pump mechanism on those is very sensitive to how tight the screws are torqued. I had one seize on me, and the tech rep told me to back off the screws some. I did what he said, and it worked fine.
It resolved the problem, but I my opinion, that's not a very robust design.
It resolved the problem, but I my opinion, that's not a very robust design.
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#11
Rotary Freak
iTrader: (1)
There are two general types of pump motors:
Flooded: The electric motor is designed to be submerged in fuel, and uses the fuel to cool it. Sparks can't form because there's no oxygen around the brushes. This is the type of motor used in virtually all modern OEM fuel pumps.
Dry: The electric motor is not meant to be submerged, and may create sparks when it operates. To see an example, run your electric drill in the dark; you'll likely see sparks. If fuel gets near the brushes, those sparks will light it off. This is the type of motor in the Mallory 4070.
Flooded: The electric motor is designed to be submerged in fuel, and uses the fuel to cool it. Sparks can't form because there's no oxygen around the brushes. This is the type of motor used in virtually all modern OEM fuel pumps.
Dry: The electric motor is not meant to be submerged, and may create sparks when it operates. To see an example, run your electric drill in the dark; you'll likely see sparks. If fuel gets near the brushes, those sparks will light it off. This is the type of motor in the Mallory 4070.
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