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universal electric fuel pump??

  • Thread starter Thread starter apcsox
  • Start date Start date
A

apcsox

Guest
noob here with a noob question...... tried searching and didn't find any answer........ so, I drive a 1980 GS550E... first old vehicle I have ever driven and first vehicle with a carburetor (or four)........ my question is, I know that on some older cars, people buy those universal electric fuel pumps, like the little mr gasket one, and stick it in the eingine...... I was wondering if anybody has done this to their GS, if it can be done, if so how to set it up, etc. etc..... just one of those random thoughts since I look at them daily behind me at work
 
I know they work on gravity, it was just one of those random thoughts that shot into my head, that maybe a fuel pump could help at higher RPMs or something.... I'm not too knowledgeable on carburetors, thats all
 
The capacity of the carbs to feed fuel exceeds the ability of the engine to consume it, assuming that everything is adjusted properly.

The only time you should need to pressurize your fuel is if you have a turbo or a supercharger on a bike that will be pumping out a LOT more than Mr. Suzuki ever imagined.

.
 
Steve said:
...

The only time you should need to pressurize your fuel is if you have a turbo or a supercharger on a bike that will be pumping out a LOT more than Mr. Suzuki ever imagined.

.
Click to expand...

Or if you want to locate another fuel source lower than your carbs. check the forums for Fuel injection conversion. Mostly people rob the fuel pumps off of other newer bikes. I think a couple of people have used pumps fom very small cars like Geo Metros. Honestly, it would be pointless if you are running everything as is.
 
Only reason to add a fuel pump would be if you were to do a conversion to an injection systems. Im not sure what the lowest an auto pump would produce but I think I remember reading that an inline 4 only needs something like 4 psi.
 
Hammered said:
Only reason to add a fuel pump would be if you were to do a conversion to an injection systems. Im not sure what the lowest an auto pump would produce but I think I remember reading that an inline 4 only needs something like 4 psi.
Click to expand...

Yep, looked at doing something like this on my scoot. lowest fuel pump would go is 3lbs. The consensus of people was that the float needle could not hold back 3 lbs of fuel pressure and would just dump the fuel into the carbs.

Ya could do a looped fuel system, pumping from one tank to a remote tank and have a return line going to the primary tank, using the secondary to actually gravity feed the carbs, but why bother at that point. In my case, that was the whole idea, not to have a tank in the standard mounting position. Two tanks, not worth it IMHO.
 
Carbs that are designed for gravity feed run between 1.2 and 1.5 psi fuel feed pressure.
If you're using gas - roadrace sidecar or similar - a Honda CBR1000 pump with inbuilt regulator is the popular choice.
If you're on Methanol or similar high volume fuels, a Facet or similar pump with a Hilborn bypass valve in the tank return line works very well.
I used to do a lot of TQ's and imported from the US a 0 - 5 PSI gauge so that I could set the pressure accurately

Greg T
 
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