Hello everyone if someone can help plz do i have a problem child on my hands its a 2006 volvo S40 fwd it has a few issues my first one is no fuel pressure i exchanged 3 PEM boxes already and still no fuel to getting to the engine but when i power up the fuel pump directly with 12v via the PEM connector the fuel pump runs builds pressure up the car starts and runs for as long as the fuel pump is manually supplied with 12v power after i disconnect the 12v supply the car runs until it runs out fuel maybe 20-30 sec.

i also had a problem with the cabin fuse box it got wet and got corroded i took it out and cleaned the box as best as i could i also noticed that there were some burn spots on the connector and the plug i was wondering if i can just replace the fuse box with another used one and do i have to reprogram the new fuse box .....

 

Ugly water damage there! There's really no easy answer to damage like that - you may be able to fix the problem with a judicious cleaning of all the connectors, and by applying some sort of protectant to prevent future corrosion.

Otherwise, it's "just" a matter of tracing backward through the fuel pump power supply to find out where "bad" turns to "good". I have to believe the problem is going to be one of those nasty, corroded connectors / pins / cables.

If it was my car, I'd get some dielectric grease, and coat / slather it on all the problem areas, and plug/wiggle/unplug the connectors repeatedly, after cleaning all the obvious corrosion I could find first. that MIGHT burnish the connections enough to allow them to start working again.

Or not - you may end up having to go postal and cut off the connectors / replace fuseboxes, etc.

Either way, good luck!

 

thank you for the reply i have already cleand all the connectors and found one brocken pin in the fuse box so i will just get another fusebox and replace it but would you know if i have to reprogram the new fusebox or can i just replace it

 

I really can't imagine needing to program a new fusebox - even in a Volvo (who saw fit to encode bizarre things like the steering column lock module). The fusebox should just be 12 volts in and out, with no digital data going near it.

 

well i actually opened the fusebox to repair the broken pin and there it was a circuit board with bunch of microchips

 

Since it's a Volvo, nothing really surprises me... ;-) I'm pretty (but not entirely) sure that the module is really not "part of the fusebox" other than in location. But yeah, I suppose it COULD be a module that requires reprogramming by the stealership. Don't have my Volvo any longer, and never had a good manual (don't think one exists) so I really can't add anything useful.

 

well thank you anyway for your help you tried andcwe all learn something new every day i will post sone pictures of the fusebox in a few days i got a used one coming of fleebay i just hope that i don't have to pay a visit to the steelership will see

 

Sounds like the Fuel Pressure Sensor has gone bad.

 

well it was the fuel pressure regulator in the fuel pump .
yesterday i took the fuel pump out now just waiting for the new one to arrive