i have a 91 xr7.iwent to start it the other day and all it would do is almost start.when it does start it sounds like its running on 5 cyls. for 3 secs and dies.i try to run a code test and i get a constant beep.i can take out fuel pump fuse and then read codes.and get no bad codes.im a good mec. but new to this com. gig could it be a bad in tank pump? being drug in to comps. i love my 7.