BMW E31 Fuel Pump

Product Details
BMW E31 Fuel Pump is a complete fuel pump assembly designed for the BMW E31 850i, 850ci, and 850CSI models, specifically for the M70 and S70 engines (1990-1997). This fuel pump is located under the passenger rear seat and includes a top rubber seal. The design incorporates several improvements to address common issues seen in the original fuel pump assembly.
One of the most significant problems with the original design is the fuel leakage that occurs due to micro cracks forming along the parting line at the top of the assembly. Over time, thermal expansion and contraction cause these cracks to appear, resulting in fuel leaks. The new design completely eliminates this issue by creating a stronger and crack-resistant top cap. Additionally, the original fuel lines are replaced with high-pressure, fuel-resistant corrugated PTFE lines that provide a much more reliable and durable solution, eliminating the need for rubber hoses that degrade over time.
Furthermore, the new assembly uses military-grade PTFE insulated wiring, resistant to modern fuels like E10 and ethanol, preventing electrical shorts and extending the lifespan of the wiring inside the fuel tank. The fuel pump motor itself has been upgraded from copper commutators to quiet, long-lasting carbon commutator motors that offer 3 times the lifespan of the originals. These new motors can deliver up to 150 LPH (liters per hour) while maintaining the factory 3 BAR pressure precisely.
Lastly, the fuel level sensor has been re-engineered with modern components to improve precision and durability, ensuring long-term reliability.
Benefits
- Completely redesigned to eliminate fuel leaks from the parting line
- High-pressure fuel-resistant PTFE lines for enhanced durability
- Military-grade PTFE insulated wiring for superior resistance to modern fuels
- Upgraded fuel pump motors with carbon commutators for longer life and quieter operation
- Capable of delivering up to 150 LPH, improving fuel delivery over the OEM 110 LPH
- Re-engineered fuel level sensor for improved accuracy and longevity
- Plug-and-play installation with all necessary components included
This Part Fits the Following Vehicles
Make | Model | Submodel | Engine | Special Fitment Notes |
---|---|---|---|---|
BMW | E31 | 850Ci | M70 5.0L | Use vehicle selector to confirm fitment |
BMW | E31 | 850Ci | M73 5.4L | Use vehicle selector to confirm fitment |
BMW | E31 | 850Ci | All | Use vehicle selector to confirm fitment |
BMW | E31 | 850CSi | S70 5.6L | Use vehicle selector to confirm fitment |
BMW | E31 | 850i | All | Use vehicle selector to confirm fitment |
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New/Unused Product Returns
ECS Tuning will accept returns for unused products within 90 days of the ship date for a refund to the original payment method used. The customer is responsible for the return shipping costs and fees. If selecting to use a prepaid shipping label, the shipping cost will be deducted from the total refunded amount. All new/unused products must be new, unused and must be in the original packaging, including labeling, manuals, hardware, etc. Special order parts are non-refundable.
In the event that we find an error on our website or on behalf of an ECS Tuning Representative, we will provide a return shipping label from the original delivery location.
Refused Packages
Any domestic orders that are returned to ECS Tuning as refused by receiver or non-deliverable will be subject to a return handling fee and will be processed as a return in compliance with our standard return policy, including a 15% restocking fee.
Any international orders that are refused at the time of delivery will be subject to carrier abandonment of the package, at which time the ordered products would be discarded by the carrier. The customer will not be refunded for the value of the order and the discarded products are no longer retrievable.
Return Process
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Please note: Refunds will be processed to the original payment method used on the order or to an in store credit, respective to the type of return that is made as well as any pre-existing arrangements with an ECS Tuning Customer Service Representative. In the event that multiple forms of payment were used, we will refund the value to an in store credit. In the event that a return label is provided, these charges may be deducted from the total refund you receive.
Original shipping costs are non-refundable and the buyer is responsible for return shipping charges. ECS Tuning will not accept COD deliveries.
All in store credit balances will expire after one year from the original purchase date.
Shipping Policy
Free Shipping On Orders $49 & Up
Items marked with a 'Free Shipping On Orders $49 and Up' logo may qualify for free standard economy ground shipping to the contiguous United States (48 states) for most orders with a value greater or equal to $49.00 USD. Oversized products and direct ship products are excluded from this offer unless otherwise noted.
Free Shipping
Items marked as 'Free Shipping' may qualify for free standard economy ground shipping to the contiguous United States (48 states). Oversized products and direct ship products are excluded from this offer unless otherwise noted.
The policies listed above are subject to change at any time without notice.
Lifetime Replacement
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Why You Should Shop From ECS Tuning
ECS Tuning stands out as more than an automotive parts supplier-it's a vibrant community fueled by a shared passion for cars. Born from the enthusiasm of car lovers, we offer an unmatched understanding and commitment to the automotive world, providing high-quality parts and accessories sourced from our own experiences. Our selection is meticulously crafted to meet the highest standards of performance, quality, and design, catering to both the latest trends and classic styles.
Our distinct advantage lies in our passionate team and comprehensive support, offering expert advice and seamless service from selection to installation. Shopping with ECS brings exclusive perks, including our Lifetime Replacement Guarantee and free shipping on orders over $49, enhancing the value of every purchase. As a central hub for car enthusiasts, ECS Tuning fosters a rich community where ideas and experiences flourish, transforming us from a mere supplier into a platform where automotive dreams come to life.
Cancellation Policy
At ECS Tuning, we understand that plans can change. That's why we offer a flexible cancellation policy for our customers. You may cancel your order at any time before you receive the shipment confirmation. This policy is designed to provide you with peace of mind and the flexibility to make adjustments to your purchases as needed. Should you decide to cancel your order, simply reach out to our customer service team, and we will assist you with the process swiftly and efficiently.
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