Question about 1998 Mercury Sable

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Problems with the fuel pressure system on 98 mercury sable

I just had a bad fuel pump replaced on my 98 mercury sable. shortly after the fuel lines blew out. the guy i paid to replace the fuel pump said that i probably need to replace the fuel pressure regulator because its old and might not pull the fuel as fast as the new pump can push it. i did not yet put a new pressure regulator in but i had him replaced the blown lines. the car seems to run ok now but im worried the lines will blow again (he had to drop the gas tank to replace last time). i dont know much about cars and this guy seems competent but i dont know if the lines blew because he did something wrong when he replaced the fuel pump or if this is true about having to also replace the fuel pressure regulator. he also replaced the fuel filter. i was wondering if maybe he put it on backwards the first time and then fixed it when he replaced the lines. dont know if that would cause the blowout. im finding a new mechanic next time, but for now what needs to be done?

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I'm not sure what this guy has done and not saying anything bad about him. I just want to help and explain a litle about your fuel system. As far as the gas lines blowing, You have metal and rubber hoses and am guessing the rubber hoses are the ones that had a problem. The only reason the metal ones would go is rust or something hittting them and knocking a hole in them. Ruber hoses can get rotten and get a leak. Below are some pictures of the underside of the fuel tank and as you can see many of those lines are mounted and if some of those mounts were not disconnected is could have pulled on one of the rubber lines and ripped it. I'm guessing that's what happened and he may have just said they blew. Will get to a blown line in a second. By the way I have been working on cars for over 25 years and have forgotten to disconnect things and ripped lines happens. Now fuel lines "blowing", in my years of working on vehicles I have hardly come across this unless the car sat for a long time and the fuel system was clogged up but even in those cases they were old and rotten. The fuel pump should only constantly run when turning the engine over or while it is running. If the system were that clogged it wouldn't run there for no extra pressure would really build up. When you turn the key to just the on position the fuel relay turns on for a few seconds and then automatically shuts off. Therefore your not just building and building pressure. Now the fuel regulator is done by vacuum. If it were bad you would have less pressure. They do not clog and cause a build up of fuel pressure and if they did, there is a diaphram inside the regulator that would blow and develope a leak (vacuum wise) and again no or little pressure not more. Below is also a picture of the fuel regulator and on top of it you can see where the vacuum line attaches. I hope I was able to help you understand a bit and just didn't confuse you more. Hope this helps...

problems with the fuel pressure system on 98 mercu - 2_19_2012_12_37_29_am.jpg

2_19_2012_12_37_49_aproblems with the fuel pressure system on 98 mercu - 2_19_2012_12_38_10_am.jpg><br><img src=2_19_2012_12_38_28_am.jpg

Posted on Feb 19, 2012


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