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Old 09-05-2016, 10:11 AM   #1 (permalink)
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Default Fuel issues

87 samurai got a new weber carb last winter. Had been running fine until a few weeks ago acted like it was running out of gas. Bucking and jumping going down the highway. Pull out choke and it would smooth out for a 1/2 mile or so then continue bucking jumping. Shut motor off, leave key on and it would run again. I assumed fuel pump was going out. Replaced electric pump with a similar one.

Suzuki External Inline Fuel Pumps - Low and High Pressure

Also installed fuel pressure regulator and adjusted according to Weber specs, blew out fuel lines and still cannot get good fuel flow. Took it out last night and still get the same out of fuel symptoms as before. I am at a loss where to look next. TIA
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Old 09-21-2016, 01:39 PM   #2 (permalink)
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Sounds exactly like issue I have with my '86 Samurai. I have replaced the fuel filter, fuel pump, and spark plugs. No change...will try timing, coil, and timing belt next. I have the Hitachi carb on mine, therefore it does not appear to be carb issue.
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Old 11-02-2016, 04:30 PM   #3 (permalink)
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Don't forget to check the voltage you are getting at your new pump. Do your symptoms only occur on the highway, or at low speeds too?

A symptom i'm having that might be worth checking for your vehicle:
When I depress the accelerator very lightly, the engine dies. When i depress it moderately, it revs up just fine. I cannot cruise smoothly at low gears with my foot off the gas. That is, the car starts to buckle quicker than expected. I release my foot and the car begins to stall as if the engine were dying. This is normal, of course, but it seems like it is more pronounced because of low fuel delivery. If you have something similar, we might be able to confirm its fuel related.

For thoroughness, here's what i've tried: New filter, new pump, new plugs, checked timing. Timing is acting strange (the reading bounces around about 1/8"), so im putting in a new belt, and tensioner. I think I've got a ground problem, but that shouldn't affect the fuel delivery on my vehicle since i've got a mechanical pump. I also have the weber carb.

One last tid-bit: Two days ago, I couldn't start my car. It was acting like it didn't have fuel, so I filled it and it started as it usually does. When I went to fill it was only missing about 3 gals. Thus, I think it's fuel delivery.

Let me know what you find.

Cheers!
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Old 11-07-2016, 02:25 PM   #4 (permalink)
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just throw parts at the problem
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Old 11-07-2016, 02:29 PM   #5 (permalink)
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Hahah, some of us are working with multiple problems !
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Old 11-07-2016, 09:24 PM   #6 (permalink)
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Rez:

If you have a mechanical pump with low flow, check the supply line for restriction or a leak (Works on vacuum principal, sucks air and lowers fuel)

Easy way to check line, pressurize tank via fill, (with fuel pressurized, if line leaking, will drip).

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