Harbor Freight Tools Water Pump 3878 User Manual

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  
 
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  
 
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.  
Page 4  
SKU 3878  
 
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.  
Page 5  
SKU 3878  
 
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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