Question about 1998 Volvo S90
When grounds off gets power to the pump,...when the grounds wire to the battery terminal is off u get power BUT THEN ON U DO NOT GET POWER TO THE PUMP
With the key on, you should get power for the first 3 seconds. Then the computer has to see oil pressure or RPM to know that the engine is running before it will power the pump relay.
The computer grounds the relay to make the connection for pump power. The power is cut if the engine is not running to prevent a fire in a wreck.
Posted on Sep 13, 2012
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Posted on Jan 02, 2017
SOURCE: 1985 Volvo 240 no fuel no spark
well first the fuel pump relay is bad, that is easily replaced. next you have no spark. the first thing you do is take the cap off the distributerand crank the engine. if it spins that tell syou thyat at least the tang or gear on the shaft of the distributor is ok and not broken. next thing is remove the #1 plug and use a 1/4 drive extension 6" long and turn the crank by hand until the #1 cylinder is top dead center(put the extension in the hole of head where the plug was and you should feel the top of the piston also make sure you can feel the top of the piston with half the extension this way you don't drop it in the cylinder with the piston at TDC(top dead center) the rotor of the distributor should be pointed at the #1 firing position. IF it does not that means your timing is off and you need to retime it by taking off timing cover and either replacing the belt/chain or gears. now if you do not have a distributor and you have a coil pack there could be only 2 things that won't give spark. either a bad coil or your altenater is bad(the battery is responsible for starting not running the vehicle like alot of people assume. the altenator energizes the coil which inturngives spark. hope this helps you please rate this thanks
Posted on Sep 07, 2008
you have to spin the pump a little and work around pay attention to how it comes out my first one i got excited and couldnt get it back in but i lowered the tank a little and it was easier
Posted on Jul 21, 2009
SOURCE: 1984 DL in tank fuel pump.
The in-tank pump does run constantly. The outer pump is the one that is switched. I'd suggest that you rewire properly, as using a jumper will cause you more headaches.
Posted on Oct 30, 2009
There is a fuse up by the Battery alone in a white receptacle with red wires. It may not be blown but is corroded. Thoroughly clean it. This feeds the Fuel pump circuit.If tat is good the white fuel pump relay under the glove box may be bad.
Posted on Jan 14, 2010
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