Question about 1991 Buick Park Avenue

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Diameter of fuel line - 1991 Buick Park Avenue

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3/8 or 10mm

Posted on Sep 06, 2010


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SE 3.1l. Where can I get a diagram showing fuel lines and part names?

you can visually see the lines. the 3/8" diameter line is the pressure line and the 5/16" line is the return line. you buy fuel lines for it and replace the O rings while you do them. if they are rusty then replace both lines.

Sep 01, 2015 | 1997 Pontiac Grand Prix

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Need fuel diagram for 96 blazer 4.3 from tank to ?

You can't mix these lines. One is 3/8 in diameter and the other is 5/16 in diameter. They are just two metal lines running from the tank to the top of the engine intake plenum, near the back. The 3/8 line has a fuel filter connected to it. To access the regulator or injectors and injector lines. You have to remove the plenum.

Oct 10, 2014 | 1996 Chevrolet Blazer

1 Answer

Diameter of fuel line for 1995 carolla

Are you talking the Fuel Line (Metal) or Hose (Rubber)?

Here are some facts you need to know to work with the OEM fuel lines.
  1. The threaded fittings used in the fuel system are a bit strange considering this is a Japanese vehicle. There are two fitting sizes used: 1/8-28 BSPT (Yes the first one is a British Pipe thread!) and 13mm x 1.5. (The diameter I measured on this fitting is .504, which is larger than a 12mm fitting (.472), but smaller than a 14mm (.532) This would logically make it a 13mm. It it NOT a 1/4-BSPT as I had orginally thought.) There appears to be no such thing as a 13mm compression fitting available for purchase. If you should find a source for these, PLEASE let me know!
  2. The female threads on the carb inlet, glass fuel filter inlet and outlet, and the fuel pump inlet and outlet are 1/8-28 BSPT. (So are the intake manifold small threaded holes and the block holes for the oil pressure sensor and oil lines. )
  3. There are two thread adapters (Toyota calls these Unions) used in the Cruiser fuel line system: a straight female 1/8-28 BSPT to 13mm x 1.5, and a 90 degrees female 1/8-28 BSPT to 13mm x 1.5. The 90 degree fitting is only used on the fuel pump outlet to adapt the fuel pump to the hard line.
  4. The OEM hard fuel line is 8mm in diameter (.314"). 5/16" (.312") is close enough in size to not matter much.
  5. OEM soft (rubber or the clear plastic) fuel lines are no longer available.

Apr 06, 2013 | 1995 Toyota Corolla

1 Answer

Where is the fuel filter and how often should it be changed?

3 years,not more than 30,000 miles

Should be under car,near fuel tank

All you have to do is get under it and look around

You will however need a fuel line release tool,
so measure fuel line diameter

Feb 26, 2011 | 1997 Lincoln Continental

1 Answer

Were is the fuel pressure regulator located

follow the fuel line to the fuel rails, should be a 2 inch diameter round piece with a vacuum line in it

Nov 16, 2010 | 2000 Cadillac DeVille

1 Answer

We are trying to replace a fuel pump for a 98 pontiac transport 3.4L and we are not sure which fuel lines hook up to which line on the fuel pump

the center fitting on the fuel pump is for the evap hose. It will have a different connector than the two fuel hoses.

The fuel pressure hose is the larger diameter. The return line is the smaller diameter. If you look carefully at the two outside fittings on the fuel pump module you will notice they are two different sizes. The return line will only fit on the smaller diameter fitting.

Oct 09, 2010 | Pontiac Trans Sport Cars & Trucks

1 Answer

Fuel pump replacement..need to know where each hose hooks onto pump....i.e return fuel line vs vapor line to charcoal filter....picture would be nice

the center fitting on the pump is for the vapor line. The large diameter fitting is the pressure line. The smaller diameter fitting is the low pressure line.

Oct 09, 2010 | 1997 Chevrolet Blazer

1 Answer

There are two metal lines coming off engine that rusted and has a leak and they come down so far and connect to two lines that go to the rear of the van.

There are 3 types of lines that go to the rear of a car. If you have a van with rear heater, they could be coolant lines for the heater. These would be about 1.25 inch in diameter.
There are 2-3 lines from the fuel tank to the engine compartment. One is the fuel line, one is the evaporation control line. If a third, it might be a return line for overpressure. These lines are about 0.5 inches in diameter.
The brake lines for the back wheels will go from the brake system master cylinder to the wheels. These lines are about 0.25 inch in diameter.
If any of these is leaking, it will have to be repaired. Please let us know if you have questions.

Sep 17, 2010 | Plymouth Grand Voyager Cars & Trucks

1 Answer

I have an 89 chevy 1 ton dualy and converting the tbi to an edlebrock 750 and need to know wich fuel line is supply and wich is return and if it is a vacume advance or not

The larger diameter fuel line is the fuel supply line, and the smaller diameter fuel line is the fuel return line. The distributor for that vehicle should have no vacuum advance on it, and the distributor should look like the one in the image below.

The fuel pressure for that carburetor (or for any other carburetor) should be around 7 psi only, and if the fuel pressure exceeds more than 10 psi it will start to push the fuel past the needle and seat and it will flood the engine. If you are going to use the same fuel pump that was used for the TBI then you will need to install a fuel pressure regulator, preferably one with a fuel gauge, and set it for 7 psi.

Of course you do know that the vehicle will never pass an emission test once you have converted it over to carburetion, and the MIL (Malfunction Idicator Light) or "check engine light" will most likely be on constantly. Let me know if you require any further assistance.


Aug 23, 2010 | 1989 Chevrolet C/K 3500

1 Answer

Fuel line rusted out on my 1988 nissan pathfinder. Can I replace with a flex line? Also need line diameter.... thanks.. 6 cyl.

The line diameter should be 3/8 fuel feed line, and 5/16 fuel return line if the vehicle is fuel injected you must use fuel injection hose and fuel injection clamps. if its got carb. them you dont have to use fuel injection line.

Mar 23, 2010 | 1988 Nissan Pathfinder

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