I'm currently fixing my 1994 Volvo 940 sedan and it won't start, we replaced the battery, have spark and compression, and fuel is making it to the fuel rail, but i feel as thought the injectors may either be dirty or bad, how would I be able to tell, and if it's not the injectors what else may it be because there's fuel in the rail as i said but everyone else is saying that the engine isn't getting enough fuel, any ideas, I'm open to about anything at this point

 

did you test the fuel pressure at the rail? There's a minimum PSI (my guess is about 20-25) to get a squirt. what happens if you spray some starter fluid into the intake path (ie via a vacuum line etc)? Did you try jumpering the fuel pump relay to build fuel pressure? Note unless the car was sitting for years injectors shouldn't fail. I do have a spare set of orange injectors from an 850 that I can send you if you want to try swapping them out (PM me with your details).

Also, check out volvotips.com for some suggestions on diagnostic steps and you may find something on how to check the injector control module and its relay.

 

When i spray starter fluid into the air intake it starts but doesn't run unless there's starter fluid and i haven't checked the fuel pressure thank you and I'll let you know about the injectors but my 940 was sitting for a while before i got it and it sat for a while longer because i wasn't home to fix it, I'll see what I can do to test the injectors and I'll get back to you on that but first fuel pressure.

 

kind of rare for injectors to fail - and if they do, it would be one at a time not all four. I'd be thinking fuel pressure (pump issues/clogged pick up, clogged filter), injector relay or controller vs the injectors themselves.

 

+1 on what mt6127 said. Did you replace the fuel filter at all? Drain the tank? If a car has sat for a lengthy time you may end up with crud in the tank. When you run it the crud goes to the fuel filter and clogs it and you end up with low fuel pressure. I have heard of cases on cars that sat for a while where they replaced the filter and it ran fine for a while and then had to replace it a second time because the new one became clogged.

 

We once tried to take the fuel filter off, it is under the drive strat in the underside of the car, it's in a cage like thing and we can't get anything off without stripping the threads

 

It's gonna have to come out and be replaced. The 240's the main fuel pump and filter was suspended on a platform underneath the drivers side. The platform was held by 3 bolts that screwed into the floor pan. It was easiest to drop the whole assembly. They typically came out even though they looked rusty since the bolts screwed into the pan with the nuts on the interior of the car. I am not familiar with the 940 but I would expect something similar.

 

I would agree with act1292, as difficult and destructive as it may be, the fuel filter is your likely culprit.
Can you hear the "under seat" fuel pump run when you start the car? That may also be a part of the problem.
The link line between the pump and filter will likely break so be prepared to buy a new one.

 

Can you access the lines to/from the filter? I'm thinking you may want to see if you can bypass the filter temporarily to see if that resolves the issue before tearing it out and replacing...

 

I've been tryin to take the fuel filter off for a while now but it's stuck, the cage around the filter is stuck in due to oxidization and there's a bolt that holds one of the lines onto the fuel filter that has been stripped I've cleaned the injectors and I have spark and compression, is there something I can do without drillin bolts out? Fuel won't make it to the fuel rail and I'm working my way back and I'm stuck at the filter

 

So my fuel filter bolt was cross threaded and I'm trying to take it off i broke my fuel line is there a specific fuel line for the Volvo i need to order or can i get any cheapo fuel line to put on because i broke the line that leads from the fuel pump. Thank you all for your help in my project but i could use some more help lol.

 

The fuel line (with the banjo fitting) is available, but is expensive https://usparts.volvocars.com/a/Volv.../GR-65402.html
It's #14 in the diagram. I have read (but forgot where) that others have fabricated their own fuel line by cutting the hose off the fittings and the warming up some new nylon/plastic fuel line and swaging it by hand.
I've never done it, but it apparently can be done. I'll see if I can find the link. This is the story and description of the process, but for a different fuel line http://cleanflametrap.com/fline.html
It might be easier to find a junk car and pull the entire assembly out and disassemble it on your bench.

 

Generic rubber fuel line is not rated to hold the pressure of a Fuel injection system. You would need fuel line rated at at least 100 psi. Generic stuff is probably rated at no more than 25 psi. And to reuse a fitting with the black plastic - is almost impossible to do correctly. You would need to heat both the fitting and the hose up to x degrees and keep it at that temp when pressing the hose on.

I always sourced a replacement (new or used) complete hose when that problem came up.