SELF-PRIMING
SIPHON PUMP
3878
ASSEMBLY and OPERATING INSTRUCTIONS
Due to continuing improvements, actual product may differ slightly from the product described herein.
®
3491 Mission Oaks Blvd., Camarillo, CA 93011
Copyright © 2006 by Harbor Freight Tools®. All rights reserved. No portion of this
manual or any artwork contained herein may be reproduced in any shape or form
without the express written consent of Harbor Freight Tools.
For technical questions and replacement parts, please call 1-800-444-3353
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9. Maintain tools with care. Keep Siphon Pump clean for better and safer performance.
Follow instructions for changing accessories. Inspect tool hoses periodically, and if
damaged, have them repaired by an authorized technician. The handle must be kept
clean, dry, and free from oil and grease at all times.
10. Stay alert. Watch what you are doing, use common sense. Do not operate any tool
when you are tired.
11. Check for damaged parts. Before using any tool, any part that appears damaged
should be carefully checked to determine that it will operate properly and perform its
intended function. Check for alignment and binding of moving parts; any broken parts
or mounting fixtures; and any other condition that may affect proper operation. Any
part that is damaged should be properly repaired or replaced by a qualified technician.
12. Guard against electric shock. Prevent body contact with grounded surfaces such as
pipes, radiators, ranges, and refrigerator enclosures.
13. Replacement parts and accessories. When servicing, use only identical
replacement parts. Use of any other parts will void the warranty. Only use accessories
intended for use with this tool. Approved accessories are available from Harbor
Freight Tools.
14. Do not operate Siphon Pump if under the influence of alcohol or drugs. Read
warning labels on prescriptions to determine if your judgment or reflexes are impaired
while taking drugs. If there is any doubt, do not operate the Siphon Pump.
15. Maintenance. For your safety, maintenance should be performed regularly by a
qualified technician.
16. Self Priming Pump. This pump is self priming. DANGER!! Attempting to prime the
pump by using your mouth on the hose could result in severe illness or death.
17. Only transfer and pump gasoline in a well-ventilated area. Make sure your work
area is well-ventilated and clear of any flammable materials. WARNING!! Gasoline
fumes are highly flammable and subject to possible explosion.
18. Wash Pump after use. Always wash both hoses and Pump thoroughly with soap and
water and then air dry before re-using the Pump and hoses.
19. Store liquids in the proper container. When transfering gasoline, only put gasoline
in an approved container. Never store gasoline in a glass container.
20. Let engine cool. When transferring oil, always let the vehicle’s engine and all other
components, such as oil, cool before using the Pump. When finished, clean the Pump
of oil throroughly.
Warning:The warnings, cautions, and instructions discussed in this instruction manual
cannot cover all possible conditions and situations that may occur. It must be under-
stood by the operator that common sense and caution are factors which cannot be
built into this product, but must be supplied by the operator.
Page 3
SKU 3878
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Unpacking
When unpacking, check to make sure the parts listed on page 6 are included. If any parts
are missing or broken, please call Harbor Freight Tools at the number on the cover of this
manual as soon as possible.
Operation
To Assemble:
1. Insert one end of the clear Intake Hose (2) into a black Hose Connector (5). Insert the
hose with connector into the top intake valve of the Pump (1) and tighten securely. See
Figure 1
Hose Connector (5)
Pump (1)
Intake Hose (2)
Figure 1
2. Repeat Step 1 using the clear Discharge Hose (3), except insert this hose with connector
into the bottom discharge valve of the Pump (1) and tighten securely.
3.To begin the siphon process, put the Intake Hose (2) into the liquid to be transferred. Put
the Discharge Hose (3) into the location where the liquid is to go. Please note: Make sure
that the Discharge Hose (3) is positioned lower than the Intake Hose (2).
4. Prime the Siphon Pump (1) with 3 to 4 pumps of the plunger at the top of the Pump. Once
the liquid begins to flow, it will transfer without further pumping.
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SKU 3878
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WHEN SIPHONING GAS:
Follow Steps 1-4 listed on page 4. After each use, pump out the remaining residue of gas
from both the Intake Hose (2) and Discharge Hose (3). Wash thoroughly with soap and
water and let air dry before storing the Pump.
Please note: Many cars have a baffle (small metal flap) in their gas tank inlet to prevent a
siphoning tube from being inserted. Use a screwdriver (not included) to hold open the baffle
when siphoning.
TO CHANGE OIL:
1. Follow Steps 1-2 and then insert the Dipstick Connector (4) into one end of the Dipstick
Tube (7). Insert the Dipstick Connector (4) into the end of the Intake Hose (2). See Figure 2.
Intake Hose (2)
Dipstick Tube (7)
Dipstick Connector (4)
Figure 2
2. Insert the other end of the Dipstick Tube (7) into the engine dipstick hole until it reaches
the bottom of the crankcase. Place the Discharge Hose (3) into the oil drain pan and begin
to pump.
TO USE AS AIR PUMP:
1. Insert the Air Pressure Hose (6) into a Hose Connector (5) and then insert both into the
discharge nozzle (bottom valve on Pump). See Figure 3.
Air Pressure Hose (6)
Hose Connector (5)
Pump (1)
Figure 3
2. Tighten securely and begin pumping. Please note: To inflate footballs, beach balls, etc.,
place an inflation needle in the threaded adapter on the end of the Air Pressure Hose (6)
and begin pumping. Warning: Always adhere to the inflatable item’s recommended PSI
rating. Over-inflating could result in damage to item or a possible explosion and result in
serious injury.
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SKU 3878
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Maintenance
1. To clean, attach both hoses to the Pump and siphon warm, soapy water through the Pump
until it comes out clean. Repeat the process with clean water to wash out the soap.
2. Wipe down the Pump and hoses with a lint free cloth. Allow to air dry and keep the unit
disassembled during storage. Allow ample time for residual fumes to dissipate. Store away
from heat or spark sources.
Assembly Drawing and Parts List
1
5
3
2
8
4
6
7
Part #
Description
Pump
Intake Hose
Discharge Hose
Dipstick Connector
Hose Connectors
Air Pressure Hose
Dipstick Tube
Qty.
1
1
1
1
2
1
1
1
1
2
3
4
5
6
7
8
Air Nozzle
PLEASE READTHE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDEDTHE PARTS DIAGRAM INTHIS
MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER NOR DISTRIBU-
TOR MAKES ANY REPRESENTATION OR WARRANTY OF ANY KINDTOTHE BUYERTHAT HE
OR SHE IS QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT OR THAT HE OR SHE IS
QUALIFIED TO REPLACE ANY PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER
AND/OR DISTRIBUTOR EXPRESSLY STATESTHAT ALL REPAIRS AND PARTS REPLACEMENTS
SHOULD BE UNDERTAKEN BY CERTIFIED AND LICENSED TECHNICIANS AND NOT BY THE
BUYER. THE BUYER ASSUMES ALL RISK AND LIABILITY ARISING OUT OF HIS OR HER
REPAIRS TO THE ORIGINAL PRODUCT OR REPLACEMENT PARTS THERETO, OR ARISING
OUT OF HIS OR HER INSTALLATION OF REPLACEMENT PARTS THERETO.
NOTE: Some parts are listed and shown for illustration purposes only and are not available
individually as replacement parts.
Page 6
SKU 3878
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