Hello all, by the title you can tell that I have a 350sdl.

About 2 weeks ago the car started to run rough once it had warmed up. At first I thought it was a clogged fuel filter, so I replaced it. Then I thought that the #1 injector was clogged so I got a new one. Then things got worse now it's to the point that It will not start.

I was thinking it was the injector pump but I'm not sure how to test it. I have read some threads on this site but I am still not totally clear. Maybe someone could explain it in an easy to follow manner.

This is what I have done so far.

1) I changed the number one injector -- no effect
2) I changed the fuel filter --- no effect
3) I took off the little fuel pump next to the injector, seemed to work but not sure how to test it.

Also a bit of funny info, I took it to a shop "EDDIES MBZ" in Lawndale CA, and he said that it needed a pump but he did not say which one, but was still ordering a pump for me. After a week I went back and asked him to show me what pump he was talking about and he pointed the the cruise control unit. That's when I towed it home in a hurry.

Please help Thanks.