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bestservices, Auto Service Technician
Category: Car
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Experience:  owner auto and truck repair facility
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1987 Olds Calais: high speeds..fuel pump fuse..fuse blows..car starts

Customer Question

I have a 1987 Olds Calais, and after I run it for a long time at high speeds and then come into the city's start/stop enviorment - the fuel pump fuse blows. When I immediately put another fuse in, it blows upon ignition. After about 30-60 minutes, I install another fuse and the car starts with no problem, runs fine until I run it hard again. Would it be a safe assumption to say that the fuel pump is not running up to par, pushing to hard to send fuel to the engine, increasing it's amp draw, and then blowing the fuse?
Submitted: 12 years ago.
Category: Car
Expert:  bestservices replied 12 years ago.
    I would check the fuel pump relay first. it sounds like it is getting hot and shorting out. The fuel pump moves the same amount of fuel through the system all the time. What the engine doesn't use simply goes back to the tank. It sounds to me like when you come off the highway into traffic the temperature inside the engine compartment increases. The fuel pump relay temp goes up with it. Before changing fuel pumps I would pull it out and check it by cooling it down quickly and replacing it and see if it still blows the fuse.
Expert:  FeedMySheep replied 12 years ago.
if I am not wrong i did the following with an AC fuse.
Put a bigger value fuse and see if will not blow.
Expert:  bestservices replied 12 years ago.
   If you put a larger fuse in than what the circuit is rated for you stand a chance of melting wires and causing an electrical fire. Treat the cause , not the symptoms...

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