Question about 1992 Mazda B-Series

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Hard to start when cold and doesnt accelerate past half pedal

92 mazda b2600i doesn't start when cold unless you give a squirt of gas down intake. Also doesn't accellerate past half pedal without coughing and almost stalling out. If you let off the gas pedal its fine. Had it put on scanner and everything reading okay.

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Sounds like low fuel pressure.

Posted on Feb 27, 2009

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92 Mazda b2600i failed pressure test during emissions testing. Where would I start to fix this? They said there is a problem between the gas tank and charcoal box.


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Wont start sometimes, only when i pour gas into the intake manifold. and then cant keep it started. only stays running by lightly tapping the accelerator


it sounds like there is no fuel getting to intake.
when you step down on accelerator, it is designed to squirt a shot of fuel into the intake, which would keep it running for a few seconds. same as pouring gas down intake.

you never stated if you had carburation or injection system, in either case no fuel is getting through on its own.
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Okay, your freind may be right, that part is called the accelerator pump, it is used for starting the truck, when you pump the gas to start it this pumps a few squirts of gas into the carb. what concerns me is that you hold the gas pedal to the floor to start it, most of the time an internal leaking carb floods the engine and holding the pedal down will let it start, a quick test would be to use a carb cleaner spray and before trying to start the truck hit the gas pedal and see if inside from the top of the carb look and see if you see a squirt of gas spray out, you will need some one to push the gas pedal or you can do it at the carb, if it squirts gas then the accelerator pump may be good and carb may be leaking and need rebuilding but if it doesnt squirt then its bad and then i want you to spray the carb cleaner into the carb and try to start the truck and if its due to the accel pump then after you spray into carb the truck should fire up and run without having to hold the pedal to the floor, if thats the case then replace accel pump if it still doesnt fire until you hold gas down then crab needs rebuilding . good day. hope this is helpful.

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