Check the fuel pressure at the engine after cycling the ignition on and off a few times. You should see pressure there. If you do not, most likely the pump is not running. Why it is not running could be due to a bad relay, bad pump, or even a wiring problem. Generally it is a pump problem though. You can only be 100% sure by checking power and ground at the pump.
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www.cargurus.com > Questions > Isuzu > Rodeo CarGurusAug 22, 2011 - rodeo turns over/no start fuel rail is dry (is it the sending unit, or the fuel pump ?? how do i test ?? whats is my next step ? ... some i have ran into will pump when key is on, but will not when the car is trying to start, ele problem, ...
forums.edmunds.com > Isuzu > Isuzu Rodeo Jan 1, 2008 - 31 posts - 26 authors
The issue is the engine won't even attempt to turn over. .... My '93 Isuzu Rodeo has been having problems starting for the last few days, ever ...
Try Replacing your gas sending unit or gas pressure sensor unit, both fairly east to replace with minimal expenses. If this does not fix the problem then change the fuel pump. But start with the gas sending unit.
I would start with getting the right firing order you can look up the spec online at autzone on there site they always have diagrams than start by checking and making sure that your getting fuel either a clogged fuel filter or a bad fuel pump that is starting to go bad. Make sure you only have 1 fuel pump some cars have 2 if you have to chances are the one inside the gas tank is the one that 99% of time goes bad but check both for fuel coming out of them to be sure. To me it sounds like your ignition componenets need to be checked and make sure your confident on your firing order than start diagnosing .
If you can hear the pump run and you get no fuel its the pump, If it blew the fuse i would say the pump tied up. That happens when you run around on empty a lot, gas is what keeps pumps cool when you run under 1/8 of a tank pump is not submerged in gas to keep cool hense pump burns up.