38:
175:
255:
and other tractors and stationary power units produced from the late 1920s to the early 1940s had compression relief petcocks on the engine block, one per cylinder. These were opened during starting to de-pressurize the cylinders when spinning the flywheel by hand. Once the engine started they were
205:
The reserve position accesses the bottom portion of the fuel tank. Many older motorcycles lacked a fuel gauge, making reliance on a fuel reserve a relatively common experience. Most now have an automatic, vacuum operated petcock (that may include a
271:
had petcocks that enabled the engineers to verify combustion in each cylinder. Opening one with the engine running would result in a long blue-white flame if the cylinder was firing correctly. The procedure is described in the novel
293:
318:
186:
have a three-position fuel petcock valve (known as a "petrol tap" in the UK) mounted on or nearby the fuel tank to control the supply of
379:
102:
121:
74:
225:
Historically, petcocks were used on gravity-feed fuel systems found on automobiles. With universal adoption of
374:
150:. Historically, petcocks were threaded valves controlled by a butterfly handle; modern petcocks are typically
81:
59:
319:"Ford - Ford Pickup Truck Radiator Petcock - 1/4 Pipe Thread - Straight Outlet - 8A-8115 - Macs Auto Parts"
88:
243:
Petcocks may be used in vehicle heating and cooling systems, such as limousines and tractor trailers.
70:
55:
48:
259:
Petcocks are used to periodically drain water from diesel fuel water separators on some trucks.
222:
The most common application of a petcock in an automobile is as a drain valve for a radiator.
161:
a ball valve style petcock's is coarse, confining their use principally to on-off applications.
237:
240:, which have a petcock with off, on, and reserve positions, much like a motorcycle petcock.
8:
343:
226:
95:
368:
174:
233:
183:
20:
210:
position which bypasses vacuum operation and allows fuel to flow to the
252:
211:
158:
151:
37:
273:
187:
27:
268:
143:
139:
232:
Some historic examples of gravity feed systems include the
267:
The large MAN six-cylinder diesel engines used on German
147:
256:
closed and the engine would begin running smoothly.
229:they have all but disappeared in that application.
62:. Unsourced material may be challenged and removed.
366:
344:"MarksFriggin.com - Stern Show News - Archive"
157:Compared to the progressive control of a
122:Learn how and when to remove this message
173:
367:
178:Fuel petcock on a 1978 Yamaha XS400.
60:adding citations to reliable sources
31:
13:
246:
214:without the engine turning over).
14:
391:
262:
36:
276:and shown in the film version.
47:needs additional citations for
336:
311:
286:
1:
380:Engine fuel system technology
279:
217:
169:
142:used to control the flow of
7:
10:
396:
294:"Product & HowTo Info"
25:
18:
179:
164:
375:Motorcycle technology
177:
16:Type of shutoff valve
138:is a small shut-off
56:improve this article
19:For pet cocks, see
180:
323:Macsautoparts.com
238:early Volkswagens
132:
131:
124:
106:
387:
359:
358:
356:
354:
348:Marksfriggin.com
340:
334:
333:
331:
329:
315:
309:
308:
306:
304:
290:
127:
120:
116:
113:
107:
105:
64:
40:
32:
395:
394:
390:
389:
388:
386:
385:
384:
365:
364:
363:
362:
352:
350:
342:
341:
337:
327:
325:
317:
316:
312:
302:
300:
292:
291:
287:
282:
265:
249:
247:Heavy equipment
220:
172:
167:
128:
117:
111:
108:
65:
63:
53:
41:
30:
24:
17:
12:
11:
5:
393:
383:
382:
377:
361:
360:
335:
310:
284:
283:
281:
278:
264:
261:
248:
245:
219:
216:
171:
168:
166:
163:
130:
129:
44:
42:
35:
15:
9:
6:
4:
3:
2:
392:
381:
378:
376:
373:
372:
370:
349:
345:
339:
324:
320:
314:
299:
295:
289:
285:
277:
275:
270:
263:Marine engine
260:
257:
254:
244:
241:
239:
235:
230:
228:
223:
215:
213:
209:
203:
201:
197:
193:
189:
185:
176:
162:
160:
155:
153:
149:
145:
141:
137:
126:
123:
115:
104:
101:
97:
94:
90:
87:
83:
80:
76:
73: –
72:
68:
67:Find sources:
61:
57:
51:
50:
45:This article
43:
39:
34:
33:
29:
22:
351:. Retrieved
347:
338:
326:. Retrieved
322:
313:
301:. Retrieved
298:Autozone.com
297:
288:
266:
258:
250:
242:
231:
224:
221:
207:
204:
199:
195:
191:
181:
156:
135:
133:
118:
109:
99:
92:
85:
78:
66:
54:Please help
49:verification
46:
234:Porsche 356
184:motorcycles
182:Most older
152:ball valves
21:Pet chicken
369:Categories
280:References
253:John Deere
227:fuel pumps
218:Automobile
212:carburetor
170:Motorcycle
159:gate valve
82:newspapers
26:See also:
112:July 2016
71:"Petcock"
274:Das Boot
188:gasoline
28:Stopcock
269:U-boats
200:reserve
136:petcock
96:scholar
353:3 July
328:3 July
303:3 July
198:, and
144:liquid
98:
91:
84:
77:
69:
251:Many
208:prime
140:valve
103:JSTOR
89:books
355:2018
330:2018
305:2018
236:and
75:news
196:off
165:Use
148:gas
146:or
58:by
371::
346:.
321:.
296:.
202:.
194:,
192:on
190::
154:.
134:A
357:.
332:.
307:.
125:)
119:(
114:)
110:(
100:·
93:·
86:·
79:·
52:.
23:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
