1990 Lexus LS 400 Logo
Posted on Jan 03, 2012
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No power to fuel pump relay my car is 1990 ls400 any ideas all fuses are good and fusible links

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Peter Yang

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  • Expert 74 Answers
  • Posted on Jan 03, 2012
Peter Yang
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I cant find the fuse for the fuel pump on my 1990 Plymouth Voyager. It is NOT on the fuse block on the firewall. I cant find any fuses under the hood.

The fuel pump has no fuse, it is power as described below.
The two main fuel pump power feeds involve the ASD (Auto Shut-down Relay) which disables the fuel pump, fuel injectors, ignition coil and Oxygen sensor after the loss of a signal from the distributer. The direct power circuit for the pump travels through the relay from a white fusible link which is located under the hood on the left fender panel, along with the ASD relay. The other power feed for the ASD comes from fuse #13 in the fuse block. There's a lot more involved in the operation and troubleshooting of these circuits. So please make sure your diagnosis is correct before replacing the fuel pump, and yes, you do have to remove the fuel tank
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You probably have a blown fusible link (between the starter cable post and the fuel pump relay), or a blown relay fuse or a bad relay. The fusible link and relay should have power always and can be checked with a 12 volt test light.
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94 buick century 3.1L replaced fuel pump relay no power to relay why? checked all fuses. was not getting power to fuel pump. red wire going to relay with female connection not pluged in ,what is that used...

The fuel pump relay is twice fused. The relay power is provided through a fusible link connected at the starter post that the positive battery cable connects to; and there is an in-line fuse inside a cube shaped plastic box near the relay. Either the fusible link or the inline fuse is blown, or there is a break in the wire that runs from the stater post to the relay.
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I am not getting a signal to my fuel pump, fuel pump relay nor the 10 amp fuel pump relay fuse. I have checked my wiring from the ECM to the FPR and it is good. Where does the power come from through the...

The fuel pump relay is powered by a fusible link connected to the starter solenoid on the positive battery terminal. That fusible link feeds the 10 amp fuse near the relay. You can test the fusible links with a 12 volt test lamp. If the fusible link test okay check for an open circuit in the wire between the link and the 10 amp fuse. Hope this gets you fixed.
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No power to fuel pump. Turn key on and fuel pump does not work. Fuel pump is new

start small. Did you reconnect the wiring? Have you checked fuses and/or relays? It is most likely a small issue if the pump is new. Make sure all wiring is correct and work up to the fuses/relays. A text light will be your best friend in this particular situation. If there is no power to the relays, you have to work your way from there to your ignition. Good luck. Hope it helps.
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1990 ford festiva no power to fuel pump. replaced relays , fuel pump, checked safety shutoff. nothing .. ran hot wire to fuel pump and pump worked but car still not trying to start. got spark. now what

The pump should have a fuse in the fuse block. You need to check for power in the fuse block and you need to check power to the pump relay.

Sometimes there is a fusible link to the Relay. If you check the connector terminals for power where the Relay plugs in, you can determine if the fusible link has blown. You could have already replaced the bad parts and now need to restore power to the Relay.
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No power to fuel pump 1990 jeep cherokee already checked relay its fine.

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Volvo 740 gle 1990

Check under the hood for a box containing your fusible links (they look like large blade fuses in most modern vehicles). The fuel pump relay only operates the fuel pump. It doesn't provide power to the rest of the fuel system. Odds are the fuse for the injection system is blown. The inside of the cover of most fusible link cases usually has a diagram which tells what each fuse is. The easiest thing to do is locate that fuse and remove it (with the vehicle off of course) and visually inspect to see if it's blown. If it is, simply replace it and see if that corrects your problem. While you're under the hood you might want to trace the wires back to their origin and check to be sure the harness is not rubbing or chafing against anything that might have caused wires to break and short. It's rare for those fusible links to blow without a reason.
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