Mecr 502 vst fuel system problem

kmills71

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Joined
Jul 25, 2020
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hello new here been reading hundreds of posts on the vst delete...vst vaporlock....
mechanical fuel pump flowing great into bucket. Vst tank is building pressure intank and from reading that should not be happening. While fuel is in vst tank engine runs fine and has 37psi at the rail. 3 to 5 minutes and pressure drops engine dies. Remove vst cap and bowl is empty. Theory is a oring failed allowing pressure inn tank overpowering mechanical fuel pump? Any ideas.
 
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