AEM 400LPH High Pressure Inline Fuel Pump - M18x1.5 Female Inlet to M12x1.5 Male Outlet
Universal fit Not vehicle-specific
Fitment notes- Authorized dealerGenuine AEM parts, sourced direct
- 30-day returnsSee the return policy
- Diesel techs on the line908-223-9744, call or text
- Secure checkout
AEM 400LPH High Pressure Inline Fuel Pump - M18x1.5 Female Inlet to...
The AEM X-Series Wideband Gauge and X-Series Inline Controller support the 4.9LSU sensor and offer both factory calibration resistor and free-air calibration methods. Factory calibration provides precise calibration when the sensor is new, while free-air calibration can help correct sensor drift as it ages. AEM Wideband UEGO (Universal Exhaust Gas Oxygen) Controllers accurately monitor engine Air/Fuel Ratio (AFR), providing critical data for tuning. Running rich can reduce power, while running too lean may cause engine damage, making accurate AFR monitoring important for optimizing power and efficiency. The UEGO sensor connector should not be modified because it contains a calibrated resistor specifically matched to the sensor; modification will invalidate the sensor output. Independent testing by 360° Product Testing against 17 competitor wideband UEGO controllers found the AEM X-Series Inline and X-Series Wideband UEGO AFR Gauge with 4.9LSU sensors recorded the fastest response times. Wideband UEGO sensors are wear items and can be affected by leaded fuels, automotive fluids, particulates, mechanical or thermal shock, and unheated exposure to exhaust. Free-air calibration may correct sensor drift, but sensor replacement as part of regular vehicle maintenance is recommended; follow the instruction manual when calibrating. AFR ranges include Gasoline 8.5:1-18.0:1 via 0-5V and 8.0:1-20.0:1 via CANbus; Lambda .58-1.23 via 0-5V and .55-2.00 via CANbus; E85 5.7:1-12.0:1; Ethanol 5.2:1-11.0:1; and Methanol 3.75:1-8.0:1.
Installation Instructions- Compatible with Flex Fuel (E85/E90) and all types of gasoline (100% Alcohol fuels may diminish fuel pump life)
- Popular "044 Style" physical configuration but with AN inlet & discharge port connections
- Maintains very high flow even at boosted fuel pressures; 340LPH @ 73 PSI (30 psi boost)
- Designed for high output naturally aspirated and forced induction EFI vehicles
- Each pump individually tested to flow minimum of 400LPH (100gph) @ 40 PSI
- Installs externally or in-tank
- Brand
- AEM
- Part number
- 50-1009
- SKU
- AEM50-1009
- UPC
- 840879025892
- Category
- Fuel Pumps
- Weight
- 2.8 lb
- Shipping
- Ground, ships in 1 to 2 business days
- Emissions
- Not CARB compliant. Not for sale or use in California.
Universal fit. This part is not vehicle-specific. Check the dimensions in the description, or text us a photo of what you are replacing and we will confirm it before you order.
Not sure it fits? Call 908-223-9744 or text us the year, model and engine. We confirm fitment before you order.
- Shipping
- In-stock parts ship in 1 to 2 business days. Tracking is emailed as soon as the label prints.
- Returns
- 30-day returns on unused parts in the original packaging. Return policy.
- Warning
- This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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Good to know
Questions, answered straight.
If it is not here, call or text the counter. Real people, real answers.
Fitment
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Will this fit my truck?
The Fits section at the top of the page lists the manufacturer's applications for this exact part. If your year, make and model is not there, or you are not sure, text us a photo of what you are replacing with your year and engine and we will confirm it before you order.
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What if I order the wrong part?
Call or text us before it ships and we will swap it. After delivery you have 30 days to return it in new, uninstalled condition. The return policy has the restocking details.
Shipping
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When will it ship?
In-stock parts usually ship within 1 to 2 business days from warehouses across the USA. The stock line under the options tells you the status of the part you are looking at. Large items ship LTL freight and we call to schedule delivery.
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Why did I only get part of my order?
We ship from multiple warehouses, so an order with several items can arrive in more than one box. Tracking for each shipment is emailed as it goes out. Full details in the shipping policy.
Returns and warranty
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What is the return policy?
30 days from delivery, in new and uninstalled condition, with a restocking fee. Everything is spelled out in the Returns & Refund Policy.
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How do warranty claims work?
We are an authorized dealer, so the manufacturer's warranty applies to every part we sell. Call or text us with your order number and we handle the claim with the brand for you.
Paying
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Can I pay over time?
Yes. Shop Pay installments are offered at checkout on qualifying orders, and the monthly estimate shows right under the price.
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What is a core deposit?
Some remanufactured parts, like injectors and turbos, carry a refundable core deposit. It is shown on the product page when it applies and refunded when your old part comes back to us.
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Why buy here
A diesel shop that sells parts, not a website that sells boxes.
Every part on this site is one our own techs can stand behind.
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We run what we sell
A working diesel repair and fabrication shop in Nazareth, PA. These are the parts our techs install every week.
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Real techs on the phone
Call or text 908-223-9744 and you get a diesel tech, not a script.
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Authorized dealer
Genuine parts straight from the manufacturer, with the factory warranty behind them.
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Fast from stock
Most in-stock parts ship in 1 to 2 business days from warehouses across the USA.
Authorized dealer for 140+ brands
All brands
- 7+ Years in business
- 6+ Shop technicians
- 30,000+ In-stock SKUs
- 25+ Trucks given away
The shop floor, Nazareth, PAFull Send Diesel, Nazareth, PA
A team of diesel people, not a call center.
Full Send Diesel is a shop full of techs, builders and parts people in Nazareth, Pennsylvania. When you call or text, you reach someone who works on these trucks and knows the parts.
Not sure what you need? Send a photo of what you are replacing with your year and engine. We will point you to the right part, confirm it is in stock, and get it moving.
Mon–Fri, 8am–4pm ET. After hours, text or email and we answer first thing in the morning.
