Fuel level senders

On Fri, 20 May 2005 06:21:10 GMT, Ross Herbert put finger to keyboard and composed:

Not in my case. One end of the resistive element is NC, and the element is not sealed. In any case, how could you seal a moving float arm?

- Franc Zabkar

empty

sustain

mix

is

Not necessarily. I've seen fuel pumps with commutators immersed in the fuel. They work just fine.

sufficient

Sufficient energy for what? The mixture in a fuel tank is too rich to ignite, particularly on a hot day. The fuel's vapor pressure would be quite high. Upon takeoff, the decreasing atmospheric pressure would drive the vapors out of the tank, replaced by pure fuel vapor from the warm fuel.

Probably not. Its just interesting to note the things they overlook.

several

mix

Doubtful. The center tank was, for all practical purposes, empty. Why would a pump be running in there?

very rarely explode

Or with a cellular phone. ;-)

-- Paul Hovnanian mailto: snipped-for-privacy@Hovnanian.com

------------------------------------------------------------------ Optimist: "The glass is half-full." Pessimist: "The glass is half-empty." Engineer: "The glass is twice as big as it needs to be."

tanks

An oil leak will start a pretty good fire too.

very rarely explode

They do ? News to me but we don't have US cars much here.

Hmmm. Not quite worthy of a Darwin Award but the principle was bang on.

Graham

Not always. Spillage of brake/clutch fluid onto a hot engine manifold has been identified as a cause of an increase in car fires in some models. After the older soldered-on metal brake fluid reservoirs were replaced by plastic 'plug in' ones, a relatively minor shunt could dislodge the reservoir and spray fluid all over the engine compartment.

I have securely tied mine onto the metal body of the master cylinder.

to

that

Hang on, wouldn't they be stannum hats then? And would Argentum hats be used in the Falkland Islands by the British?

Ken (I've got such an aura about me that I wear an aurum hat to protect others!)

Well, now you're getting into the area of, "Define, 'work'". I think an aurum and argentum hat might be very becoming, in the right circles. Heavens knows, they're (argentum and aurum) quite popular amongst electronics aficionadi, albeit not necessarily as headgear.

Amen!

area > is

The fuel pumps on a 747 are 120V 3 phase (400Hz). There are no commutators.

ageing

The

due to fuel

What was the primary failure in each case?

modelling to

Why elaborate? Probably because the simple explaination didn't get them the right answer.

been > several

system being

I see that this whole issue has been placed on a back burner now that the US airlines are in financial trouble. It will be interesting to see if they ever go through with it.

I was told about this by a local Fire Officer.

They were packing up the fire engine after dealing with some minor incident when two cars collided nearby. The bump was only a minor one with little damage, but one car immediately burst into flames.

They promptly lifted the bonnet (hood) and extinguished the fire, but to their amazement there was no petrol leak. Instead they found the part-melted brake fluid reservoir dangling by its sensor leads above the exhaust manifold.

Then they went back through the records and found a number of similar incidents where the fire might have had the same cause.

His advice to me was to securely tie on the brake fluid reservoir with something like a nylon ratchet strap - I actually use waxed nylon loom lacing cord. (Remember how to lace wiring looms, do they still teach that?)

You'd have to read the detailed accident report no doubt.

It's been shown that it's incorrect to assume that vapour in the tanks is not flammable though.

Found with a quick gooogle gives the overview.

Graham

area > is

I can see that could be true. The ones Boeing used on the 747 did have isolated commutator compartments though IIRC.

Ahh - but that has always been the presumed wisdom.

Events have shown otherwise. A couple of 737s have 'blown up' on the ground due to fuel tank explosions.

That's the perceived wisdom for sure.

But here's the snag.

The centre tank on TWA 800 was almost empty. There was some elaborate modelling to illustrate how its potential for ignition varied with altitude too.

It's interesting to note that there is now an economical fuel tank inerting system being developed.

Graham

tanks very rarely explode

don't recall a scale but

IIRC ).

Just back-and-forth-and-back-and-forth... just enough to put a drunk to sleep, see...

Newsgroups: alt.binaries.schematics.electronic Subject: Accident Discussion, From S.E.D - AccidentSite.pdf (1/2) Message-ID:

and add 70+ MPH to it, and you have disaster.

single storey there.

I live about 2.5 miles west of where Ray and Chandler Blvd merge.

As for single story dwellings, most here are single story, except the lower-priced homes, where the land/lot premium dominates the cost. My home is 3650 sq-ft single-level.

...Jim Thompson

I know of a case where a bar patron came out at closing and tried to start his car. The carb caught on fire, so the (volunteer) fire department was called out to put it out. No problem, they used a CO2 extinguisher and it knocked it right out. No foul. The second time the guy started the car the carb cought on fire again. The firemen put it out once again. The third time the fireman grabbed the "wrong" extinguisher and loaded the carb with powder. He then said "oops", finished the paperwork, and went home and back to bed.

vapour

empty

gases

sustain

air mix

The flight crew don't always turn off all the pumps you might expect them to.

I'm fairly certain the scavenge pump was running ( possibly an oversight ? ).

Graham

tanks very rarely explode

Just out of curiosity I looked tor a map and found one with Ray Road marked. I don't recall a scale but I'd guess by British standards it's quite a gentle curve ( does an almost 180 IIRC ).

If you can point me to a more detailed map I'd be interested to see.

The map was a realtor's btw. I was intruiged to see how many houses seem to be single storey there.

Graham

I once soldered together six coffee cans to make a popgun. IOW, it's as long as you make it. We fueled it with lighter fluid, and, it seems that I've learned WAY too late, we were loading it with way, way too rich of a mixture. It just barely blew the plastic thing off the top.

Heck, you can make a neat pop with a little flour and a candle, if you follow the instructions. >:->

-- Cheers! Rich ------ "Attracted by repeated newspaper advertisements, and realizing that his waist had gone both East and West despite his daily racquetball, a young executive appeared at a local health resort. Looking over the several weight loss plans offered, he selected one guaranteed to reduce his weight by two pounds per day. After a light breakfast, and a almost non-existent lunch, he was escorted to a large room, where a young, attractive woman told him that "if he caught her, he could have her". After an hour of hard running, he finally gave up; and weighing himself, was comforted to realize that he had lost just under three pounds. Returning the next week, he chose the plan that was to reduce his weight by four pounds per session. After following the same regimen, he was again escorted to a large room, but after two hours of running, he caught the young woman. Weight loss, just over four pounds. Returning the following week, he chose to lose eight pounds in a single day. He was shown to the largest room he'd seen, by far, where he was confronted by an extremely muscular, burly man, who looked him square in the eye, flung his towel into a corner, and snarled, "You know the rules. Start running!""

Ohhh... I want one. How long is the tube?

Anno