Question about 1991 Mazda 626

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Fuel Leak Was wondering if you know where I can get info on how to replace a fuel pressure regulator for 1991 Manzda 626. I have a fuel leak and took it to a mechanic who stated it was the fuel pressure regulator. He wanted $550 to repair and I ordered the part online for $95 and want to try to fix it myself - don't need to put any more $$$ into this car it is my 16 year old sons. Any ideas???

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Did you check the fuel filter and make sure the hoses are on properly and the hoses aren't cracked? Check the ends of all fuel line hoses; they may be cracked at the ends. Make sure any clamps on the fuel lines haven't pinched the fuel hose; it may crack it and cause a leak and you won't see it because it may only leak when the engine is running. Check the fuel line after you have turned on the engine and make sure you have a fire extinguisher on hand and within arms reach.

Posted on Jun 29, 2008

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2 Answers

Fuel loss. checked fuel line that pinhole was before, no smell, no sign of gas anywhere. took a drive that usually uses 1/4 tank of gas, this time it used 3/4. checked eeverywhere when i got home.


I need year--make--model--engine size to look up vehicle info?
Use a fuel pressure gage, not only check correct fuel pressure, see if fuel pressure will hold for a bit, with everything off. If the pressure drops like a rock, you have a pressure leak. Could be a fuel injector leaking? Where applicable, check fuel pressure regulator vacuum line, if it has gas in the line, the regulator is faulty.
Smell of the crankcase oil dipstick, does it smell like gas? If so, I wouldn't drive it till you fix the problem and change oil and filter as many times as needed to get rid of the gas.
How long since overall tune-up? 02 sensors sensors ever changed? Sometimes a faulty coolant temp sensor may cause the engine to run rich? Are there any driveability issues? Any applicable trouble codes? Don't replace anything unless your testing points in that direction. I can't see anything from here, as far as external leak, anywhere?

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1 Answer

1999Buick regal gs. Car shut off like it wasnt getting fuel changed filter got me home ran fine then cranks stuts back off like no fuel again blak flood smoke coming out exhaust


Use a fuel pressure gage, check for proper fuel pressure, key on engine off. Then with key off, see if pressure will hold for a bit? If the pressure drops like a rock, check for a fuel pressure leak, check for fuel injector leak and fuel pressure regulator leak. If fuel pressure regulator is connected to fuel rail and has a vacuum line, check to see if gas in the vacuum line, if so, pressure regulator is faulty.

Check for applicable trouble codes? How long since a tune-up?

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fuel rail contains o'ring and seal washer. the fuel regulator is at end of rail

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I can smell fuel really strong and the car would stop and not start back up for about an hour. I had the fuel pressure regulator replaced and had the fuel pump and fuel filter replaced. The car still...


Replacing one injector is not good as the full set must be changed for best performance. the fault seems more likely with an overflow of fuel due to poor settings or fault in the fuel delivery.
It seems the fuel pump is the suspected part, you need to have a good calibration with a check for fuel leak or faulty gaskets. When the AC is ON , the power required is more and so the throttle opens up with more fuel. The firing intensity and the INGITION SYSTEM, the spark plugs must be checked. A look as the spark plug will indicate the firing and fuel condition. Also the exhaust analysis will give a good report of the un-burnt fuel which means a correction in fuel settings.

Sep 17, 2011 | 1991 Buick Skylark

1 Answer

Have trouble code 45 on a 1993 s10 blazer 4.3l. Have replaced oxygen sensor, did not help


1994 Chevrolet S10 Blazer 4.3L, Vin W Customer Concern: DTC 45 The spark plugs are black on both banks. Right bank plugs are damp. Removed the tuning valve and looked inside the plenum. Can see a washed/clean area on the right side. Fuel pressure is good, it holds when the pump stops. Tests/Procedures: 1. Remove the upper intake plenum cover and inspect for a fuel leak at the fuel pressure regulator.

2. Inspect the fuel pressure regulator and return lines and fittings at the left side of the plenum.

3 Replace the Central Multipoint Fuel Injection (CMFI) unit. Potential Causes: Leaking Fuel Line - One or more may have a problem.
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Tech Tips: The fuel pressure regulator may only leak at a cold or hot engine, only with vacuum applied, or only without vacuum applied. The leaking at the fuel lines and fittings have as often been the result of repairs as the initial cause of the problem. Handle the lines and fittings carefully. The fuel pressure regulator is a integral part of the Central Multi-port Fuel Injection (CMFI) unit. Any failure requires entire unit replacement.

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When you turn the key on excessive fuel flows into the air intake. its a 1989 6 cylinder 3.1 fuel injected


You could have either an injector that is stuck open or a fuel pressure regulator that has developed a leak. A leaky injector will usually only leak fuel into one cylinder as it is located just above the intake valve in the lower part of the intake while a leaky fuel pressure regulator will leak fuel into the front end of the intake manifold [behind the throttle plates] and the fuel will acuumulate throughout the upper intake plenum. When a fuel pressure regulator develops a leak the fuel that is escaping from it flows through the small 1/8" diameter plastic vacuum line which goes from the top of the regulator to the intake manifold. Even a trace of fuel in this line means the regulator is bad. I've seen both leak items leak but probably replace 10 regulators leak for every one injector. Good luck, hope you find your problem!

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1 Answer

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2 Answers

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That is a broken or rusted fuel line. It only leaks when the fuel pump is running.

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