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Hey new guy here,

I just drained and refilled a 780 by jumping the connectors from the fuel pump relay. No problem with the pump running. I added new gas and went to start. Also had charged the battery. It'll turn and everything but wont kick. So I replaced the fuel pump relay with one from another car (same relay). Still wont start. I am not sure what my next move is. I am thinking of testing the fuel pressure regulator, but that seems unlikely. Any suggestions including diagnostics would be much appreciated! O, and my dad said he got the car to run for a bit using ether so I am pretty certain it is a fuel issue.
 

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You can use the primitive, but effective, diagnostic unit under the hood that will flash a sequence of lights to show a faulty system. This is a detailed explanation of how to use the system: https://www.volvoclub.org.uk/faq/EngineOBDCodes.html#LH24FuelInjectionFault

It does seem unlikely it is the fuel pressure regulator, but you could unhook the lines and (carefully) turn on the car to see if you are in fact getting fuel, or put a test on the injector itself.

I have also found, after much searching on my 780 a broken noise suppression relay as causing flue injector interruption. Dave Barton has more information and relays if you need them: http://www.davebarton.com/volvorelays.html
 

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Good advise so far, but knowing the year may help a little too. This car came with at least 3 fuel injection systems and two different motors. They have a V6 and the turbo four. The diagnostic system is only present on late turbo models, I think starting in 1990.
 
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