dear all modification enthusiast,
This is to share some of the experience I've come across after selling so many units of Walbro GSS342 fuel pumps. Yes, we even took out to see the internal guts of the pump. I am talking about original walbro pumps and not those fake pumps with plastic gears.
Walbro are great pumps for modified cars. As they are able to provide 255lph of fuel to the engine provided enough current is supplied to the pump. Not just that, it can support high pressure too. Fuel pump is like your heart. If it stops, so is everything else.
Prices has dropped drastically for these units as they are being sold as (pumps only) and you can source for your own filter unit and socket. FYI, they share the same power socket as most stock DENSO in-tank pumps. However, they are also available as in kits. Meaning, the filter unit, power sockets and install bits are packed into a single box for a specific application. But the price is of course higher.
http://a5.sphotos.ak.fbcdn.net/hphotos-ak-snc6/262171_213356502039416_111966582178409_575638_4311621_n.jpg
Now... back to the main topic.
Common Failure of the Walbro Pumps is actually due to the installer and user. Here are some of the failure which I can think of.
1. Fuel starvation for long period of time. Inside the pump are metal gears (just like the oil pump) they have tight clearence for optimum pumping power. Once that clearence is out of spec, fuel doesn't flow as it should be anymore. Symptoms are drop of fuel pressure or the gears inside the pump is jammed. Overheating the electric motor and eventually destroys it. (so never leave your fuel tank empty)
2. Dirty fuel supplied to the pump. (refer to attached picture). Dirt, sludge and rust will surely destroy the internal gears and electric motor. The motor like any other electrical motors runs by using magnets.. if you have rust, all these rust will be stuck at the magnet.. making the motor to overheat due to extra resistance from the rust that built up around the magnet.
http://a2.sphotos.ak.fbcdn.net/hphotos-ak-ash4/312048_276917952349937_111966582178409_784709_282633054_n.jpg
3. Insuffient current supplied to the pump. (this is my theory) as we know, powerful pumps need more current to run better. Stock wire and perhaps the stock relay wouldn't be strong enough to support these performance fuel pumps. Most likely aging wires will cause less current to flow to the pump and the earth(grounding) aren't strong enough. I recommend replacing the fuel pump wires and re-route a new relay to power the pump thus reducing the chances of this type of fault.
4. Dropping the pump. Walbro are precision enginereed pumps. Drop it and it will be destroyed. The check valve (the black tip on top where the fuel is pumped out), once broken, it will be rendered useless.. do not attemp to fix it back using 2ton glue or whatsoever.
5. Installation error. The fuel hose used to connect the top valve must be securely fasten to the pump, any leaks or kink will definitely effect the pump performance. The hose must be suitable for in-tank use. Meaning the outer layer can be soaked in fuel without causing it to expand. Best if you could re-use the stock hose that came with the stock pump. Otherwise please buy the correct fuel hose.
6. Thinking that Walbro pumps could last forever... bad mistake... Fuel pumps typically get weak after around 6-10 years. Best is to replace the pump after 7-8 years of usage. No manufacturer can make a fuel pump that last forever with optimum performance.
7. Engine bogs after Walbro is installed. Stock engines and ecu like the Honda B16A, Mitsubishi 4G93 DOHC aren't tuned to use with a higher rate pump . With a spanking new walbro pump installed fuelling will be a lot richer especially when the ECU uses *open loop fuel maps*. Therefore, it is required to install at least a piggy-back ecu like SAFC, E-Manage or M7 EM-CON to correct the fuel requirements again. Consider this as an investment for better performance.
8. Clogged fuel filters - 80% of the people I know, did not know when was the last time they changed the fuel filter. Bad news for the pump. Partially clogged fuel filters will overwork the fuel pump thus reducing it's lifespan. I advise you to change the fuel filter when installing the new pump as well. Under full load your engine may not be getting enough fuel and pressure to be at optimum state.
9. Blocked fuel lines - these lines are usually at the bottom of the car. It cannot be easily inspected. But chances are if you have parked your car for long period of time, the fuel inside the line may already turned into sludge.. thus blocking the fuel line for maximum flow. So I would disconnect the fuel lines and apply air pressure to blow out the dirt or sludge if the car was not used for some time. Better still replace it altogether. Otherwise you risk chocking up your fuel injectors.
So, at any time your walbro pump fails, just don't blame it all on "I think I got a fake". Review the above common mistakes first before you change another unit.
There you go.. top 9 reasons. Share it with your friends if you like what you see.
visit facebook.com/ftzone and please like my page too. I will update it whenever I can.
*open loop* - google it for more information.
all pictures are taken personally by me. if you are sharing it, please mention. No commercial usage for my pictures please. You want to sell Walbro pumps, please take your own pictures and your own product.
This is to share some of the experience I've come across after selling so many units of Walbro GSS342 fuel pumps. Yes, we even took out to see the internal guts of the pump. I am talking about original walbro pumps and not those fake pumps with plastic gears.
Walbro are great pumps for modified cars. As they are able to provide 255lph of fuel to the engine provided enough current is supplied to the pump. Not just that, it can support high pressure too. Fuel pump is like your heart. If it stops, so is everything else.
Prices has dropped drastically for these units as they are being sold as (pumps only) and you can source for your own filter unit and socket. FYI, they share the same power socket as most stock DENSO in-tank pumps. However, they are also available as in kits. Meaning, the filter unit, power sockets and install bits are packed into a single box for a specific application. But the price is of course higher.
http://a5.sphotos.ak.fbcdn.net/hphotos-ak-snc6/262171_213356502039416_111966582178409_575638_4311621_n.jpg
Now... back to the main topic.
Common Failure of the Walbro Pumps is actually due to the installer and user. Here are some of the failure which I can think of.
1. Fuel starvation for long period of time. Inside the pump are metal gears (just like the oil pump) they have tight clearence for optimum pumping power. Once that clearence is out of spec, fuel doesn't flow as it should be anymore. Symptoms are drop of fuel pressure or the gears inside the pump is jammed. Overheating the electric motor and eventually destroys it. (so never leave your fuel tank empty)
2. Dirty fuel supplied to the pump. (refer to attached picture). Dirt, sludge and rust will surely destroy the internal gears and electric motor. The motor like any other electrical motors runs by using magnets.. if you have rust, all these rust will be stuck at the magnet.. making the motor to overheat due to extra resistance from the rust that built up around the magnet.
http://a2.sphotos.ak.fbcdn.net/hphotos-ak-ash4/312048_276917952349937_111966582178409_784709_282633054_n.jpg
3. Insuffient current supplied to the pump. (this is my theory) as we know, powerful pumps need more current to run better. Stock wire and perhaps the stock relay wouldn't be strong enough to support these performance fuel pumps. Most likely aging wires will cause less current to flow to the pump and the earth(grounding) aren't strong enough. I recommend replacing the fuel pump wires and re-route a new relay to power the pump thus reducing the chances of this type of fault.
4. Dropping the pump. Walbro are precision enginereed pumps. Drop it and it will be destroyed. The check valve (the black tip on top where the fuel is pumped out), once broken, it will be rendered useless.. do not attemp to fix it back using 2ton glue or whatsoever.
5. Installation error. The fuel hose used to connect the top valve must be securely fasten to the pump, any leaks or kink will definitely effect the pump performance. The hose must be suitable for in-tank use. Meaning the outer layer can be soaked in fuel without causing it to expand. Best if you could re-use the stock hose that came with the stock pump. Otherwise please buy the correct fuel hose.
6. Thinking that Walbro pumps could last forever... bad mistake... Fuel pumps typically get weak after around 6-10 years. Best is to replace the pump after 7-8 years of usage. No manufacturer can make a fuel pump that last forever with optimum performance.
7. Engine bogs after Walbro is installed. Stock engines and ecu like the Honda B16A, Mitsubishi 4G93 DOHC aren't tuned to use with a higher rate pump . With a spanking new walbro pump installed fuelling will be a lot richer especially when the ECU uses *open loop fuel maps*. Therefore, it is required to install at least a piggy-back ecu like SAFC, E-Manage or M7 EM-CON to correct the fuel requirements again. Consider this as an investment for better performance.
8. Clogged fuel filters - 80% of the people I know, did not know when was the last time they changed the fuel filter. Bad news for the pump. Partially clogged fuel filters will overwork the fuel pump thus reducing it's lifespan. I advise you to change the fuel filter when installing the new pump as well. Under full load your engine may not be getting enough fuel and pressure to be at optimum state.
9. Blocked fuel lines - these lines are usually at the bottom of the car. It cannot be easily inspected. But chances are if you have parked your car for long period of time, the fuel inside the line may already turned into sludge.. thus blocking the fuel line for maximum flow. So I would disconnect the fuel lines and apply air pressure to blow out the dirt or sludge if the car was not used for some time. Better still replace it altogether. Otherwise you risk chocking up your fuel injectors.
So, at any time your walbro pump fails, just don't blame it all on "I think I got a fake". Review the above common mistakes first before you change another unit.
There you go.. top 9 reasons. Share it with your friends if you like what you see.
visit facebook.com/ftzone and please like my page too. I will update it whenever I can.
*open loop* - google it for more information.
all pictures are taken personally by me. if you are sharing it, please mention. No commercial usage for my pictures please. You want to sell Walbro pumps, please take your own pictures and your own product.
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