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A check valve for a combustion engine fuel system includes a polymeric poppet valve including a valve stem and a valve head that terminates the valve stem. A valve seat is adapted for cooperation with the valve head of the poppet valve, and includes a valve seat body and an elastomeric valve seat se

A check valve for a combustion engine fuel system includes a polymeric poppet valve including a valve stem and a valve head that terminates the valve stem. A valve seat is adapted for cooperation with the valve head of the poppet valve, and includes a valve seat body and an elastomeric valve seat seal supported by the valve seat body and adapted for sealing against the valve head of the poppet valve. The check valve is particularly adapted for use with a fuel pump within a fuel system.

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What is claimed is: 1. A fuel system check valve apparatus, comprising: a valve body including a through passage; a poppet valve consisting essentially entirely of a polymeric material and having a valve stem and a valve head adjacent one end of said valve stem, the valve head having a truncated co

What is claimed is: 1. A fuel system check valve apparatus, comprising: a valve body including a through passage; a poppet valve consisting essentially entirely of a polymeric material and having a valve stem and a valve head adjacent one end of said valve stem, the valve head having a truncated conical portion and a shoulder at the downstream end of the conical portion and integral with the valve head and the entire valve head including the conical portion and the valve stem being in one piece of the polymeric material which is highly resistant to degradation when in long term contact with hydrocarbon fuels, the valve stem being carried by the body and guided for generally axial movement of the valve stem and head relative to the body to open and closed positions of the valve; and a separate valve seat assembly adapted for cooperation with said valve head of said poppet valve, said valve seat assembly including: a separate valve seat body of polymeric material received with an interference fit at least partially within the through passage of the valve body and fixed relative to the valve body; and a separate valve seat seal with a through passage and received only in and carried by said valve seat body independently of the valve body, said valve seat seal being composed of an elastomeric material constructed for sealing against said conical portion of said valve head of said poppet valve; and the valve seat body having a through passage which downstream of the valve seat seal has a conical surface which merges into a first cylindrical surface which transitions by a curved surface to a second cylindrical surface having an inside diameter smaller than the inside diameter of the first cylindrical surface and the inner diameter of the valve seat seal is smaller than the inside diameter of the second cylindrical surface and when the valve is closed the shoulder of the valve head is axially disposed in the first cylindrical surface and adjacent the conical surface of the valve seat body, and the shoulder has a smaller diameter than the inside diameter of the first cylindrical surface of the valve seat body, and the valve head engages only the separate valve seat seal. 2. The check valve apparatus of claim 1 further comprising: the valve body having a fluid passage therein, wherein said valve seat and said poppet valve are located at least partially within said fluid passage, said valve body further having a valve stem guide for guiding said valve stem of said poppet valve. 3. The check valve apparatus of claim 2 wherein said valve body is an outlet cover of a fuel pump module. 4. The check valve apparatus of claim 1 further comprising: a compression spring interposed between a portion of said valve stem guide and said valve head of said poppet valve for urging said poppet valve against said valve seat. 5. The check valve apparatus of claim 1 wherein said valve seat seal is molded to said valve seat body by at least one of a co-molding process or an over-molding process. 6. The check valve apparatus of claim 1 wherein said valve seat body is composed of at least one of PPS or POM. 7. The check valve apparatus of claim 1 wherein said valve seat seal is composed of at least one of a fluorocarbon elastomer or a nitrile elastomer. 8. The check valve apparatus of claim 1 wherein said valve seat seal is assembled to said valve seat body. 9. The check valve apparatus of claim 1 wherein said valve seat is separately assembled to said valve body. 10. A fuel pump module including a check valve apparatus comprising: a valve body carried by the fuel pump module and including a through passage; a poppet valve composed entirely of a polymeric material and having a valve stem and a valve head adjacent one end of said valve stem, the valve head having a truncated conical portion and a shoulder at the downstream end of the conical portion and integral with the valve head and the entire valve head including the conical portion and the valve stem being in one piece of the polymeric material which is highly resistant to degradation when in long term contact with hydrocarbon fuels, the valve stem being carried by the body and guided for generally axial movement of the valve stem and head relative to the body to open and closed positions of the valve; and a valve seat assembly adapted for cooperation with said valve head of said poppet valve, said valve seat assembly including: a separate valve seat body of polymeric material received with an interference fit at least partially within the through passage of the valve body and fixed relative to the valve body, the valve seat body including a through passage and a groove formed within and open to the through passage; and a separate valve seat seal with a through passage and supported by only said valve seat body within said groove, said valve seat seal being composed of an elastomeric material constructed for sealing against said conical portion of said valve head of said poppet valve; and the valve seat body having a through passage which downstream of the valve seat seal has a conical surface which merges into a first cylindrical surface which transitions by a curved surface to a second cylindrical surface having an inside diameter smaller than the inside diameter of the first cylindrical surface and the inner diameter of the valve seat seal is smaller than the inside diameter of the second cylindrical surface and when the valve is closed the shoulder of the valve head is axially disposed in the first cylindrical surface and adjacent the conical surface of the valve seat body and the shoulder has a smaller diameter than the inside diameter of the first cylindrical surface of the valve seat body, and the valve head engages only the separate valve seat seal. 11. The fuel pump module of claim 10 wherein said check valve apparatus further comprises: the valve body having a fluid passage therein, wherein said valve seat and said poppet valve are located at least partially within said fluid passage, said valve body further having a valve stem guide for guiding said valve stem of said poppet valve. 12. The fuel pump module of claim 11 wherein said check valve apparatus further comprises said valve body being an outlet cover of said fuel pump module. 13. The fuel pump module of claim 11 wherein said check valve apparatus further comprises: a compression spring interposed between a portion of said valve stem guide and said valve head of said poppet valve for urging said poppet valve against said valve seat. 14. The fuel pump module of claim 10 wherein said valve seat is separately assembled to said valve body. 15. A fuel system including a fuel pump module having a check valve apparatus comprising: a valve body carried by the fuel pump module and including a through passage; a poppet valve consisting essentially entirely of a polymeric material and having a valve stem and a valve head adjacent one end of said valve stem, the valve head having a truncated conical portion and a shoulder at the downstream end of the conical portion and integral with the valve head and the entire valve head including the conical portion and the valve stem being in one piece of the polymeric material which is highly resistant to degradation when in long term contact with hydrocarbon fuels, the valve stem being carried by the body and guided for generally axial movement of the valve stem and head relative to the body to open and closed positions of the valve; and a valve seat assembly adapted for cooperation with said valve head of said poppet valve, said valve seat assembly including: a separate valve seat body of polymeric material received with an interference fit at least partially within the through passage of the valve body and fixed relative to the valve body; and a separate valve seat seal with a through passage and supported only by said valve seat body, said valve seat seal being composed of an elastomeric material constructed for sealing against said conical portion of said valve head of said poppet valve; and the valve seat body having a through passage which downstream of the valve seat seal has a conical surface which merges into a first cylindrical surface which transitions by a curved surface to a second cylindrical surface having an inside diameter smaller than the inside diameter of the first cylindrical surface and the inner diameter of the valve seat seal is smaller than the inside diameter of the second cylindrical surface and when the valve is closed the shoulder of the valve head is axially adjacent the conical surface of the valve seat body and the shoulder has a smaller diameter than the inside diameter of the first cylindrical surface of the valve seat body, and the valve head engages only the separate valve seat seal. 16. The fuel system of claim 15 wherein said check valve apparatus further comprises: the valve body having a fluid passage therein, wherein said valve seat and said poppet valve are located at least partially within said fluid passage, said valve body further having a valve stem guide for guiding said valve stein of said poppet valve. 17. The fuel system of claim 16 wherein said check valve apparatus further comprises said valve body being an outlet cover of said fuel pump module. 18. The fuel system of claim 16 wherein said check valve apparatus further comprises: a compression spring interposed between a portion of said valve stem guide and said valve head of said poppet valve for urging said poppet valve against said valve seat. 19. The fuel system of claim 15 wherein said valve seat is separately assembled to said valve body. 20. The check valve apparatus of claim 1 wherein said valve seat body has a groove formed within and open to the through passage and said valve seat seal is supported within the groove by only said valve seat body.