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post #1 of (permalink) Old 06-23-2002, 08:11 AM
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Zook mechanical fuel pump woes

How do you trouble shoot one of these? If I try to shoot compressed air into the fuel inlet & outlet ports will it be plainly obvious if the diaphragm has failed? I've got a electric fuel pump that came with a Calmini 1.6 kit that I'm not using. Can I blank off the spot for the mech. fuel pump on my 1.3L & use this electric fuel pump with my stock motor & carb.? With all the Samurais I've owned every time I check the oil & it's really thin, I'm always worried that maybe my fuel pump is leaking gas into the motor.
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post #2 of (permalink) Old 06-23-2002, 08:56 AM
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Re: Zook mechanical fuel pump woes

a friend used used a chevy block off plate.
make sure you pull the push rod out.
make sure you use a fuel regulator and set it to factory specs.
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post #3 of (permalink) Old 06-23-2002, 01:33 PM
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Re: Zook mechanical fuel pump woes

i made a plate for mine by laying the gasket on a oiece of aluminum and spray painted it then cut it out and drilled holes.... works slick
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post #4 of (permalink) Old 06-23-2002, 02:40 PM
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Re: Zook mechanical fuel pump woes

If you blow compressed air into the system, you are liable to damage the diaphram!

A better test would be to connect a resevoir to the input of the pump (removed from the head) through a fuel line, fill it with gasoline and allow it to gravity-fill the pump. Examine the back side of the pump along with the vent tube for signs of leaking gasoline.

Since there is no "factory spec" for an electric pump conversion, you will need to buy a regulator (NAPA has one) and after installing it on the output on the pump, start with a setting of 1 PSI. Adjust it up until you have enough pressure to feed the carb without applying too much pressure to the float valve on the carburetor.

As mentioned above, you must remove the push-rod before installing a plate over the pump mount opening. Fabbing one yourself should be simple.
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post #5 of (permalink) Old 06-23-2002, 02:53 PM
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Re: Zook mechanical fuel pump woes

There is a vent tube on the pump that is not attached to any hose. If your diafram is breached, you will have oil present in that tube. Take a Q-tip and check in the tube. You should also notice oil consumption if it is bad.
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post #6 of (permalink) Old 06-23-2002, 06:43 PM
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Re: Zook mechanical fuel pump woes

I attached some tubing to the vent tube and ran it into a plastic coke bottle and drove around for a day and found the bottle had a signifigant amount of oil in it.
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