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post #1 of (permalink) Old 08-24-2002, 12:25 AM
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fuel pump leaking

I was tinkering 2day on sammy and noticed that my pump was leaking bout 1/2 way up on the passenger side i checked and tighened everthing no help then after a while it stopped i let it set it cooled down i started it again and it started leaking again is the pump bad?
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post #2 of (permalink) Old 08-24-2002, 06:07 AM
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Re: fuel pump leaking

Leaking fuel or oil? If it's oil, the pump is definitely bad. If it's fuel, it could be a cracked hose. If the pump has a lot of miles on it, I would just replace it.
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post #3 of (permalink) Old 08-24-2002, 06:14 AM
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Re: fuel pump leaking

upsman:

If there is fuel dripping out of the pipe that has no hose connected to it, <font color=red>DO NOT DRIVE THE VEHICLE!</font color=red>

Check the oil dipstick and see if there appears to be more oil in the block than there should be. Also check to see if the oil seems unusually thin.

If either is the case, the fuel pump's diaphragm has been punctured and is dumping gasoline into the lubricating system. this will <font color=red>KILL</font color=red> your engine if not immediately taken care of. Gasoline will not only rinse out any buildups in the engine, it will damage the crankshaft seals and cut the lubricating effectiveness of the oil causing the bearings to wear rapidly -- to the point of throwing a rod and destroying the block.

You will need to replace the fuel pump and drain and refill your oil. If the engine is noisier than it used to be, it may be too late -- the perfect time to do a 1.6 swap.

When replacing the fuel pump, do not touch or press on the pump lever no matter how tempting it may be to do so. Excessive pressure on the lever can break the diaphram on a new pump. Let the little push rod linkage do that.

You may be able to get more miles out of the engine, if you caught it in time, by using wear additives in the oil. I have no experience with additives -- just the broken fuel pump part...
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post #4 of (permalink) Old 08-24-2002, 05:29 PM
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Re: fuel pump leaking

Where exactly is the fuel pump located? I have read some horror stories about leaking pumps and thought I would check mine. Also, how can you tell if its leaking besides more or "thin" oil?
post #5 of (permalink) Old 08-24-2002, 05:53 PM
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Re: fuel pump leaking

The mechanical fuel pump on a Samurai is located on the passenger side of the head back by the distributor. (I am not sure if this applies to TBI/EFI Samurais which might have electric fuel pumps...) It has three pipes coming out of it - an inlet, an outlet and a pressure relief tube that points down and has no hose on it.

The pressure relief tube allows air to move in and out of the engine side of the pump diaphram as the pump lever presses on the diaphram during pumping action.

When the diaphram is perforated, gasoline seeps through to the engine side of the pump and is mixed with the oil that lubricates the mechanical linkage in the pump. As gasoline mixes with the oil, the oil becomes thinner and loses it's ability to properly lubricate moving surfaces inside the engine.

Another telltale of a broken fuel pump is gasoline driping out of the pressure relief pipe. Unfortunately, because gasoline vaporizes rather quickly, it can be hard spotting gasoline driping out of the pressure relief hole. You might be able to spot it when you start your Zuk early in the morning before the outside temperature and the engine itself gets too hot.
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post #6 of (permalink) Old 08-24-2002, 08:53 PM
 
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Re: fuel pump leaking

Some have suggested putting a hose on the relief output and running it into a clear bottle. This allows you to see what is coming out (oil,fuel or a mixture). The bottle you place where ever you have space.
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post #7 of (permalink) Old 08-26-2002, 01:49 PM
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Re: fuel pump leaking

yes it is gas coming out of the tube with nothing connected to it i checked the oil in the crank case the level has changed i havent driven it no new engine noise can i put a elec pump on and put a plate over where the fuel pump goes it carburated?
post #8 of (permalink) Old 08-26-2002, 02:40 PM
 
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Re: fuel pump leaking

Yes you can bypass the mech pump with an electric. Be sure to remove the actuating rod. An oil pressure cuttoff is a good idea, so the pump doesn't continue punping when the engine is off. you don't need gas everywhere when your upside down or otherwise crashed.

Also, Change the oil immeadiatly. It's cheap insurance.
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post #9 of (permalink) Old 08-26-2002, 05:48 PM
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Re: fuel pump leaking

Good! Looks like you causht it before any damage could be done!

You can replace the mechanical with an electric like outlaw said. The OEM mounting technique is to place it back on the frame by the tank and the filter. I mounted mine on the fenderwell with an extra filter and a pressure regulator when I converted to a 1.6 8-valve. This probably would work for you too.

I used a pump off a salvaged Tracker/Kick. I wired my pump to the fuse that carried the rear window defroster. This works well because:

1. It is switched by the ignition so the pump would run only when the ignition is on and

2. I have a ragtop, so this circuit has nothing connected to it!

Any comments from others on this?
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post #10 of (permalink) Old 08-26-2002, 10:15 PM
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Re: fuel pump leaking

With a stock carb I'd just replace the stock mechanical fuel pump. Inexpensive and easier to do than installing an electric pump.
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