Question about 1998 Buick LeSabre
Would the fuel relay take a few times to go out ?
No. The fuel pump relay is either working or its not. A relay works like a surge protector. A fuel pump produces surges of electricity as it pumps; a relay (large fuse) can only handle so many surges for so long, and thus usually at the half or three quarter mark of the life of the engine, these will "go out".
If replacing this does not solve your issue, consider having a diagnostics test performed (if you can get it to a parts dealer). If not, you'll just have to replace parts that are cheap. Here's a way you'll tell if a relay is bad:
Get a fuse tester and pull the fuel pump relay. There will (should be) four metal prongs on the bottom. You can't tell witch two are the live and feed so take two at a time and touch them to the two prongs on the tester until the light on the tester comes on - if the light does not come on when any two prongs on the relay are touched together with the tester, the relay is spent.
Before anything, however, locate the pressure valve on your fuel rail. After letting the car sit for some time after being started or driven, unscrew the valve stem, and depress the needle inside - if fuel sprays, then you have pressure. This will tell you that the fuel pressure regulator is still good. If no, or very little fuel is dispursed, then replace the fuel pressure regulator first. Also, check your airfilter and make sure it is not plugged, or torn. If so, replace. If it is excessive with dirt and debris, replace.
Also, replace the fuel filter. If your air filter, fuel filter, pressure regulator, and pump relay are all in good repair, or replaced - and the car still does not start, try one or both of the following:
1. MAS - the mass airflow sensor - clean with MAS cleaner (auto parts dealer).
2. Coil Pack(s) - if equipped - can be tested (modular under these cannot, so look for melted, white, bubbly substance - if present replace - have packs tested and replace any that are bad, and only the ones that are bad unless you prefer to do all - these can be a bit spendy per pack (not sold as set if more than one for some cars);
3. test the alternator - if the car will start, (even if you have to jump start it) with engine running pull the battery terminals off (both) and if the car dies, alternator is bad - if it remains running, it's good.
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Posted on May 30, 2010
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Posted on Jan 02, 2017
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