Pyroil 500 1991 var ett stockcarlopp ingående i Nascar Winston Cup Series (nuvarande Nascar Cup Series) som kördes 3 november 1991 på den 1 mile (1.609 km) långa ovalbanan Phoenix International Raceway i Avondale utanför Phoenix i Arizona i USA. Totalt avverkades 312 miles (502,115 km) fördelat på 312 varv. Banunderlaget var asfalt. Loppet vanns av Davey Allison i en Ford på tiden 3:15.31 körande för Robert Yates Racing. Allisons snitthastighet uppgick till 95,746 mph. Det var Allisons 13:e seger av totalt 19 i cup-serien. Prispotten uppgick till 480 860 dollar, varav 78 500 dollar gick till segraren.
| Plc | Nr | Förare | Team/ bilägare |
Konstruktör | Start | Varv | Ledda varv | |
|---|---|---|---|---|---|---|---|---|
| 1 | 28 | Davey Allison | Robert Yates Racing | Ford | 13 | 312 | 162 | |
| 2 | 17 | Darrell Waltrip | DarWal Inc. | Chevrolet | 11 | 312 | 25 | |
| 3 | 22 | Sterling Marlin | Junior Johnson & Associates | Ford | 9 | 312 | 10 | |
| 4 | 7 | Alan Kulwicki | Alan Kulwicki Racing | Ford | 5 | 312 | 1 | |
| 5 | 2 | Rusty Wallace | Penske Racing South | Pontiac | 10 | 312 | 0 | |
| 6 | 4 | Ernie Irvan | Morgan-McClure Motorsports | Chevrolet | 15 | 312 | 2 | |
| 7 | 98 | Jimmy Spencer | Travis Carter Enterprises | Chevrolet | 26 | 311 | 4 | |
| 8 | 11 | Geoff Bodine | Junior Johnson & Associates | Ford | 1 | 311 | 53 | |
| 9 | 3 | Dale Earnhardt | Richard Childress Racing | Chevrolet | 12 | 311 | 0 | |
| 10 | 15 | Morgan Shepherd | Bud Moore Engineering | Ford | 19 | 311 | 0 | |
| 11 | 5 | Ricky Rudd | Hendrick Motorsports | Chevrolet | 14 | 311 | 0 | |
| 12 | 94 | Terry Labonte | Hagan Enterprises | Oldsmobile | 35 | 311 | 0 | |
| 13 | 68 | Bobby Hamilton | Tristar Motorsports | Oldsmobile | 40 | 311 | 1 | |
| 14 | 26 | Brett Bodine | King Racing | Buick | 8 | 311 | 1 | |
| 15 | 8 | Rick Wilson | Stavola Brothers Racing | Buick | 22 | 311 | 0 | |
| 16 | 10 | Derrike Cope | Whitcomb Racing | Chevrolet | 6 | 311 | 0 | |
| 17 | 25 | Ken Schrader | Hendrick Motorsports | Chevrolet | 7 | 310 | 0 | |
| 18 | 55 | Ted Musgrave | U. S. Motorsports Inc. | Pontiac | 21 | 310 | 0 | |
| 19 | 6 | Mark Martin | Roush Racing | Ford | 3 | 310 | 20 | |
| 20 | 42 | Kyle Petty | Sabco Racing | Pontiac | 18 | 309 | 2 | |
| 21 | 76 | Bill Sedgwick | Spears Racing | Chevrolet | 24 | 308 | 0 | |
| 22 | 75 | Joe Ruttman | Rahmoc Enterprises | Oldsmobile | 27 | 308 | 0 | |
| 23 | 33 | Harry Gant | Leo Jackson Motorsports | Oldsmobile | 4 | 307 | 0 | |
| 24 | 30 | Michael Waltrip | Bahari Racing | Pontiac | 30 | 307 | 0 | |
| 25 | 9 | Bill Elliott | Melling Racing | Ford | 2 | 307 | 0 | |
| 26 | 14 | Mike Chase | A.J. Foyt Racing | Chevrolet | 32 | 305 | 0 | |
| 27 | 04 | Hershel McGriff | Smokey Yunick Racing | Pontiac | 43 | 300 | 0 | |
| 28 | 1 | Rick Mast | Precision Products Racing | Oldsmobile | 25 | 299 | 0 | |
| 29 | 23 | Butch Gilliland | Gilliland Racing | Pontiac | 42 | 299 | 0 | |
| 30 | 19 | Chad Little | Little Racing | Ford | 28 | 298 | 0 | |
| 31 | 52 | Mike Wallace | Jimmy Means Racing | Pontiac | 38 | 246 | 0 | |
| 32 | 66 | Randy LaJoie | Cale Yarborough Motorsports | Pontiac | 29 | 203 | 0 | |
| 33 | 41 | Larry Pearson | Larry Hedrick Motorsports | Chevrolet | 31 | 178 | 0 | |
| 34 | 72 | Mark Reed | James Reed | Chevrolet | 36 | 177 | 0 | |
| 35 | 21 | Dale Jarrett | Wood Brothers Racing | Ford | 17 | 151 | 19 | |
| 36 | 49 | Stanley Smith | BS&S Motorsports | Buick | 33 | 150 | 12 | |
| 37 | 73 | Bill Schmitt | Schmitt Racing | Ford | 39 | 136 | 0 | |
| 38 | 51 | Jeff Purvis | Phoenix Racing | Chevrolet | 34 | 127 | 0 | |
| 39 | 12 | Hut Stricklin | Bobby Allison Motorsports | Buick | 16 | 105 | 0 | |
| 40 | 71 | Dave Marcis | Marcis Auto Racing | Chevrolet | 23 | 91 | 0 | |
| 41 | 43 | Richard Petty | Petty Enterprises | Pontiac | 20 | 89 | 0 | |
| 42 | 29 | Gary Collins | Marion Collins | Oldsmobile | 37 | 61 | 0 | |
| 43 | 24 | Kenny Wallace | Team III Racing | Pontiac | 41 | 1 | 0 | |
| Källor: | ||||||||