Son's 1980 fuel tank line need changing?
02-23-2012, 08:14 PM
#16
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Warning for newer-type fuel hose users...
Heads-up on the new-technology hoses with the plastic intermediate layer-- they don't like sharp barbed fittings where there's a risk of rupturing that intermediate layer. Rounded OK. Place clamps carefully so they are not right next to barbs, so tere's less risk of cracking that plastic liner. Also critical that you don't try to pinch this hose to close it for downstream maintenance, like one might try do do to prevent the tank from draining while changing a fuel pump or filter.
This same warning actually applies to factory hoses too, starting with S4 cars 1988+ IIRC.
This same warning actually applies to factory hoses too, starting with S4 cars 1988+ IIRC.
02-23-2012, 08:21 PM
#17
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Heads-up on the new-technology hoses with the plastic intermediate layer-- they don't like sharp barbed fittings where there's a risk of rupturing that intermediate layer. Rounded OK. Place clamps carefully so they are not right next to barbs, so tere's less risk of cracking that plastic liner. Also critical that you don't try to pinch this hose to close it for downstream maintenance, like one might try do do to prevent the tank from draining while changing a fuel pump or filter.
This same warning actually applies to factory hoses too, starting with S4 cars 1988+ IIRC.
This same warning actually applies to factory hoses too, starting with S4 cars 1988+ IIRC.
There will be no attempt at starting the car. Tonight's list of items include the following:
1. Attach the passenger side fuel rail (this will be temporary and done w/o installing the intake as I will be replacing vacuum hoses Saturday)
2. Add fuel and verify if the fuel pump I received from NoVector works
3. Flush fuel lines with a gallon or 2 of gas to make sure they are clear and pump is working as it should.
4. Pressure test the lines after flushing to check for leaks.
5. Drain and replace as many fluids as I can before I get tired of working on the car for the night.
02-23-2012, 08:33 PM
#18
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I found Gates Barricade hose...which doesn't have a rating on the hose but their web site says its J30r14 certified. The hose does says 255 PSI.
http://gates.com/brochure.cfm?brochu...cation_id=5348
http://gates.com/brochure.cfm?brochu...cation_id=5348
02-23-2012, 08:36 PM
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I found Gates Barricade hose...which doesn't have a rating on the hose but their web site says its J30r14 certified. The hose does says 255 PSI.
http://gates.com/brochure.cfm?brochu...cation_id=5348
http://gates.com/brochure.cfm?brochu...cation_id=5348
02-24-2012, 04:25 PM
#20
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From the 1989 Service Tech Info book, (included in the JM docs CD set available through Roger):
So this new hose material was a "flying" production change starting sometime in the 1988 MY production, and applies to all 1989+ cars.
Interesting that the line between the tank and pump was not upgraded from the factory. Obviously, when new-style plastic barrier hose is field substituted for that section, the no-clamp/pinch/bend rules must then apply to the replaced section. Might be a Good Idea to call out the field substitution with a label attached to the new hose with some warnings to subsequent owners/techs.
Fuel Hoses Made of Plastic (Polyamlde)
Fuel hoses are components, which are subjected to considerable loads due to pressure, temperature and the gasoline itself.
Rubber hoses in eight cylinder engine cars were replaced by rubber-lined, polyamide pipes in the course of the 1988 model year already, in order to cope with these conditions even better and improve the service life. (Polyamide is a plastic, which is produced from carbons, phenol and nitrogen.)
Rubber-llned, polyamide plpes, however, can no longer be handled in the same manner as rubber hoses.
Handllng Polyamlde Plpes:
1. Polyamide pipes may not be bent. Bending the pipes would damage the parts permanently.
2. Polyamide pipes may not be clamped shut neither for troubleshootlng the fuel system nor for replacement of components. Clamping would damage a polyamide pipe permanently.
3. Connectors are pressed in with a great amount of force in the production of polyamide pipes. Repairing these parts is not possible. In such cases it will always be necessary to replace the entlre hose with connectors. Sleeves (2), which are installed loose in some cases, are used on connectors only as stops.
Rubber-lined, polyamide pipes can be recognized on the outside by the loose-fitting or missing sleeves.
(includes a picture of the differences and the loose sleeves used on the later hoses)
The fuel hose on the intake side of the fuel pump to the fuel tank is not included in the conversion to polyamide pipes, so that this hose may be clamped for replacement of the fuel filter or removal of the fuel tank.
Fuel hoses are components, which are subjected to considerable loads due to pressure, temperature and the gasoline itself.
Rubber hoses in eight cylinder engine cars were replaced by rubber-lined, polyamide pipes in the course of the 1988 model year already, in order to cope with these conditions even better and improve the service life. (Polyamide is a plastic, which is produced from carbons, phenol and nitrogen.)
Rubber-llned, polyamide plpes, however, can no longer be handled in the same manner as rubber hoses.
Handllng Polyamlde Plpes:
1. Polyamide pipes may not be bent. Bending the pipes would damage the parts permanently.
2. Polyamide pipes may not be clamped shut neither for troubleshootlng the fuel system nor for replacement of components. Clamping would damage a polyamide pipe permanently.
3. Connectors are pressed in with a great amount of force in the production of polyamide pipes. Repairing these parts is not possible. In such cases it will always be necessary to replace the entlre hose with connectors. Sleeves (2), which are installed loose in some cases, are used on connectors only as stops.
Rubber-lined, polyamide pipes can be recognized on the outside by the loose-fitting or missing sleeves.
(includes a picture of the differences and the loose sleeves used on the later hoses)
The fuel hose on the intake side of the fuel pump to the fuel tank is not included in the conversion to polyamide pipes, so that this hose may be clamped for replacement of the fuel filter or removal of the fuel tank.
So this new hose material was a "flying" production change starting sometime in the 1988 MY production, and applies to all 1989+ cars.
Interesting that the line between the tank and pump was not upgraded from the factory. Obviously, when new-style plastic barrier hose is field substituted for that section, the no-clamp/pinch/bend rules must then apply to the replaced section. Might be a Good Idea to call out the field substitution with a label attached to the new hose with some warnings to subsequent owners/techs.
