Electric Fuel Pump 12V Universal Low Pressure 12 Volt Transfer Inline Fuel Pump for Lawn Mower Carburetor Gas Diesel Engine 2.5-4psi HEP-02A

My old lawn tractor quit running the other day. I diagnosed it as a fuel delivery issue (it would run-- barely-- on full choke or with some carb cleaner sprayed into the engine) and figured out that the diaphragm fuel pump that runs off the pressure pulses inside the engine crankcase was not delivering much fuel. This pump is built into the side of the carburetor and the parts for it come in most rebuild kits.The trouble is, I'd already rebuilt the carburetor and fuel pump. I concluded that the pressure pulses going to the pump were a bit weak, either because the engine is getting tired or the crankcase has a leak somewhere or both. Since the engine runs very well and doesn't smoke, I decided a brute force approach was the best course. I'm good at those so I was already on familiar ground.For $10 I got this pump, and for another $12 I got a 4-pack of relays with mounting pigtails. I had some ATC fuse holders, wire, crimp connectors, etc. already. I figure this repair cost me about $25 in parts plus an afternoon of my time.I wired the relay to the hot side of the battery with an inline fuse, then wired the control side to a switched power wire from the starter switch. When I was done, the pump would only run when the key was on. Perfect. I made a mounting plate out of a piece of aluminum I had kicking around, plumbed the fuel line with a new filter and shutoff valve, zip-tied all the wires out of the way, and turned the key on.The pump cycled and filled the float bowl of the carburetor. I twisted the key to the start position and the engine roared to life. I managed to finish mowing my lawn and the tractor worked fine the whole time.This pump is a good low-cost solution for fuel delivery issues on old machines. No idea what the longevity is but for $10 if it lasts a couple of years I'll be thrilled.It's a very good idea (translation: essential) to run the pump with a fused power feed and a relay or some other means of shutting it off. Running without a fuse is an accident waiting to happen if a wire shorts out somewhere so don't skip this step. You could probably run the pump on a switch but a relay with key-on power is almost as simple and there's less danger of forgetting it on and killing your battery (or worse).I'm not sure what the max pressure of this pump is, but keep in mind that the needle valves in some small engine carburetors may not withstand it. If the pump overpowers the needle, it will overflow the float bowl and flood the engine. At that point you'd have to install some sort of bypass or regulator to return excess fuel back to the tank. This didn't happen to me so I didn't investigate.Take note of the dimensions of the pump before ordering. Those mounting legs and the hose barbs stick out a surprisingly long distance. I had trouble finding a place to mount the pump until I found a small area under one of the engine's cylinder heads. This proved to be a good spot because the inlet of the pump will gravity feed, but there were a few other spots I tried where the pump absolutely would not fit.This pump is available from a lot of different sellers on Amazon. I bought the one that had the best combination of low price and good reviews. Fingers crossed, it appears to be relatively trouble-free. I'm cautiously optimistic.

Installed the pump in a 72 Suzuki LJ20. The factory fuel pump works on crankcase vacuum but appears to be too old to get gas from the tank efficiently. Now it runs much better.

I was having problems with my John Deere riding mower D125 twin cylinder 20 hp engine with surging and very poor starting. replaced the vacuum fuel pump and it worked for a couple of months and started the same symptoms. i never liked that design so thought i would give this inline pump a try so i took the fuel pump off and mounted this inline in the same spot just forward of the fuel filter. I thought it should be able to handle the 2.5 to 5 psi and it did no problem now runs and starts great. Poor design easy fix!! Oh i did put a screw in the vacume line to seal it off!

Everything was better than expected, small problem with the part but no one at fault just stuff happens but then these guys did great when I contacted them. They had another sent out right away was amazed when I found it next morning delivered. Product work perfect I will recommend this seller 100% thank you

Installation is fairly simple. It literally stopped working after 5 minutes of use. This would be a zero stars if it weren’t for the fast replacement. Fingers crossed it lasts at least ten minutes. Will be upgrading I. The very near future, hopefully it isn’t out of necessity.

The brigs vtwin tractor/mower motors use a diaphragm pump that operates from the pressure in the valve cover from running. Problem is, as you engine gets older, valves leak, compression leaks etc, it gets weaker and weaker and the motor runs starved for fuel. I replaced the head mounted stock pump with this.the brigs machines use 1/4" fuel line and this uses 5/16 so.....Use a plastic fuel filter BEFORE the pump and hose clamps, mount the pump solid, then run the output fuel line to ANOTHER filter - use pre- and post- filters, and then into the carb.This requires very little 12v power, but you dont want this powered if the engine is not running so.....The v-twins all have a fuel bowl shutoff solenoid on the bottom of the 2bbl carb, tap into the same power source that powers this solenoid, and use it to drive a simple 12v automotive relay. For the driven side of the relay, source 12v from the battery, but use an inline blade fuse of about 10a (red)When you turn the key to on, you will hear the plunger start tick-tick-ticking and pressure will build. the vtwins need really not much more than 2psi so this is perfect.as an added safety measure since the fuel lines are on the SAME SIDE as the exhaust on the vtwin, use fuel hose only - not just any rubber hose and from the output of the fuel pump, instead of general joe hose clamps, I used high pressure clamps. you dont want this ever popping off.I was --><-- this close to buying a new tractor, then I put this on and the old girl (26 years old) has new lease on life. All my problems were fuel flow related and the vtwin 2bbl carbs are VERY susceptible to dirt in the jets. use filters.

Why did you pick this product vs others?:Good all around pump for the money I use it to pump water and bad fuel from gas tanks works great for me