Why Does A Fuel Pump Have Springs? (VIDEO)

2022-08-08 14:01:59 By : Ms. Doris Wang

Protect Your Fuel Tank and Pump With Delphi Technologies 

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Protect Your Fuel Tank and Pump With Delphi Technologies 

Simple Fixes For Bad Battery Connections

Auto Value, Bumper to Bumper Tech OTY Finalists Named

FRAM® Provides Next-Level Engine Protection for the Summer

Sponsored By BCA Bearings by NTN

Sponsored By Carter Fuel Systems

Sponsored By NGK Spark Plugs

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The training session will cover:

Speakers Andrew Markel, Director of Technical Content, ShopOwner Dennis Husband, ASE Certified Technician, Transtar AC

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Underhood Service targets repair shops that derive 50 percent or more of their revenue from the service and repair of under-the-hood systems. The expanding amount of knowledge and capital needed to keep up with technological advances has led these shop owners to concentrate on underhood systems, while also offering preventive maintenance services on most major vehicle systems. By subscribing, you’ll receive the ShopOwner digital edition magazine (12 times/year) featuring articles from Underhood Service and the Underhood Service eNewsletter (twice weekly). Access to digital editions, contests, news, and more are ready for you today!

Underhood Service targets repair shops that derive 50 percent or more of their revenue from the service and repair of under-the-hood systems. The expanding amount of knowledge and capital needed to keep up with technological advances has led these shop owners to concentrate on underhood systems, while also offering preventive maintenance services on most major vehicle systems. By subscribing, you’ll receive the ShopOwner digital edition magazine (12 times/year) featuring articles from Underhood Service and the Underhood Service eNewsletter (twice weekly). Access to digital editions, contests, news, and more are ready for you today!

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Make sure the springs and guide rods are not damaged when the new unit is lowered into the tank. Sponsored by Carter.

On this fuel pump assembly module, the bottom part of the unit that contains the pump and pick up is held against the bottom of the tank using these rods and springs. Why?AdvertisementThe answer is plastic tanks. On older vehicles with steel tanks, the fuel pump was a hanger style with a pick up pressed against the bottom of the tank. Due to the rigidity of the tank, the tank does not change shape as the fuel quantity or internal pressure changes. With a plastic tank, it can change shape under certain conditions. Remember, gasoline weighs 6.3 pounds per gallon. So a full tank can weigh as much as 130 lbs. The fuel tank could see pressures as high as 15 psi and low as -5 psi. This can change the height of the bottom of the fuel tank.AdvertisementThis is why some fuel pump modules have these rods and springs to push the bottom of the tanks. Without them, the pick-up could become uncovered, and the fuel pressure could drop. Also, the sender could give inaccurate readings. Can they fail? Yes, the most common failure mode is when the plastic housing the rods and springs cracks and can’t move freely, or there is no tension. When installing this type of pump, make sure the springs and guide rods are not damaged when the new unit is lowered into the tank. This video is sponsored by Carter Fuel Systems.

The answer is plastic tanks. On older vehicles with steel tanks, the fuel pump was a hanger style with a pick up pressed against the bottom of the tank.

Due to the rigidity of the tank, the tank does not change shape as the fuel quantity or internal pressure changes. With a plastic tank, it can change shape under certain conditions. Remember, gasoline weighs 6.3 pounds per gallon. So a full tank can weigh as much as 130 lbs.

The fuel tank could see pressures as high as 15 psi and low as -5 psi. This can change the height of the bottom of the fuel tank.

This is why some fuel pump modules have these rods and springs to push the bottom of the tanks. Without them, the pick-up could become uncovered, and the fuel pressure could drop. Also, the sender could give inaccurate readings. Can they fail? Yes, the most common failure mode is when the plastic housing the rods and springs cracks and can’t move freely, or there is no tension.

When installing this type of pump, make sure the springs and guide rods are not damaged when the new unit is lowered into the tank.

This video is sponsored by Carter Fuel Systems.

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