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I have a Reznor UDAP250 running on LP. Every so often it will try to ignite and you can hear an explosion and it will blow the side panel out

Had the pressures checked and all are correct.

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Posted on Jan 02, 2017

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SOURCE: forester ac compressor cycles every few seconds but pressure on lp side shows high in gauge

Is it possible you hooked up to the factory service port on the high side instead of the low side port ?
Can you hook up a set of gauges to both high and low ports ?

Posted on Jul 29, 2012


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Megan 2005 knocking from underside of car when i take my foot off the accelerator pedal and let the car run free, i have fitted a new exhaust back end braket and the knocking is still there

A knock in the motor is caused by excess fuel vapor traped in the cylinder(s).
EX: The piston moves up, spark ignites compressed air/fuel mixter, ignition forces piston back down, some fuel vavor is left unburned. Piston return trip up, unburned vapor is egnited untimely, and immediatly after new air/fuel mixter is ignited.
the second explosion rocks the upper of the cylinder beating on the valve cover, if in more than one cylinder the sound is louder.
this is caused by a weak spark and/or unballance in air/fuel ratio.

If check engine light is on, scan for codes, if this is fixex right away it cause further damage.
flooding the motor, cause No Start
blowing through valve cover gasket
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when you hear the knock louder in lower of the motor, that is an indication that the rod bearing(s) are going to go out soon, and your car is going to leave you stranded.

Best thing to do,

Stop Driving Car Until You can have your mechanic properly diagnose the problem, and be fixed.

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Does a 1994 Chevrolet Silverado c1500 have a fuel pump

Yes, it has an electrical fuel pump located in the gas tank. First check the fuel pump fuse located in the fuse panel on the left outer side of the dash. You can only access this panel with the driver's door open. It is located near the black button for the dome lights and chime.

It is a 20-amp fuse. Replace it if it is blown, but ONLY with a 20-amp fuse. The wire harness for the fuel pump sometimes goes bad, or the pump motor, or the wire harness inside the tank to the pump motor. If the blown fuse is replaced with a larger-amp fuse, you could cause a fire or explosion.

If it blows the replacement fuse, stop. Fuses blow for a reason, 9 times out of 10. Call a tow truck to remove the truck to a qualified repair shop.

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muffler explosion
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1994 corolla cranks but, won't start, and blows a 15 amp fuse of some kind

There is a possibility this could be your fuel pump fuse. Without current the fuel pump will not pump fuel and the engine will not run. Can you be more specific about which fuse is being blown? The fuses in the engine compartment are identified in the diagram on the fuse box cover. If this is not legible, take a picture and post it here to identify the fuse. The fuses in the inside compartment are identified in a diagram on the fuse panel door.

Does the fuse blow as soon as you turn the key in the ignition, or does it blow after you crank the starter?

Try this: turn the ignition key to the on position. The fuel pump is right under the rear seat on the passenger side. If it is running you will hear it humming. You can also hear it humming from outside the car. It will run even with the engine off, but with the key in the on position. If you do not hear anything, the fuel pump is not running.

If the fuel pump is not running it could be due to a number of causes. Could be a faulty pump, or faulty wiring, or faulty harness. You will need to diagnose the cause with a voltmeter.


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Likely the ignition system is shutting down. Code tests must be done as well as individual component tests, using a digital multi-meter and a manual such as chilton or haynes as a guide. The small explosion you hear likely is from a small amount of unburned fuel entering the hot exhaust and exploding right after the ignition is off. Once you fix the cause of shutdown that will disappear. The main items I'd test first are the crank sensor, cam sensor and the ignition switch itself, any of which can cause a shutdown. Also make sure the fuel pump isn't getting hot and turning itself off.

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Sounds like you have a ignition timing issue or it is possible your engine is running extremely rich and a partially plugged muffler and after the fuel vapors accumulate in the exhaust system then you get an explosion causing your muffler to expand. However I would first look at ignition timing and if that checks out move on to exhaust system or emissions systems.

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I think you should check the air manifold on the control panel and try to find any broken or loose hose.
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