Jeep Enthusiast Forums banner

Mechanical fuel pump upgrade

4K views 16 replies 8 participants last post by  Jeepsr4me 
#1 ·
I have a 1987 Jeep Wrangler with the inline six and a weber 38 on it and I want to get ride of the mechanical fuel pump and go with an electric one. Does anyone know the best way to do this? Is there a kit?
 
#8 ·
booboowv77 said:
I would leave the mechanical on as a back up in case the electric one fails.
If you don't disconnect the fuel lines, the mech pump will act as a restricion to the elec pump and if the mech pump is over powered you'd blow the diaphragm. If you disconnect the fuel lines and leave it in place, it will fail fom being ran dry. The fuel coming thru cools the pump much like it does an electric one. IMO the Mech fuel pump is an advantage over electric and would leave it in place (K.I.S.S. method). A mech pump is much less likely to fail and your carb does not need any more fuel pressure than what it provides. If you must go electric, get a block off plate.
 
#9 ·
You can get these 7 psi pumps at just about any parts house. Last one I bought was like 22 bucks, even came with a inline filter before it. Remember electric pumps like to push fuel not pull it. So mount it LOW like on the frame rail. I never liked the mech ones on the block. WHEN they leak, they always do, they fill the oil pan full of fuel and ruin bearings.
 
#12 ·
Awesome thanks for the info. Another question I'd like to ask is the order of components starting from the tank. My current understanding follows this setup:

Tank
Fuel Pump w/integrated filter (Mounted by tank)
Fuel Filter w/return line (Engine Bay)
Fuel Pressure Regulator w/gauge (Engine Bay)
Carb

Some people have placed the FPR before the filter and I don't see why.
 
#13 ·
My current understanding follows this setup:

Tank
Fuel Pump w/integrated filter (Mounted by tank)
Fuel Filter w/return line (Engine Bay)
Fuel Pressure Regulator w/gauge (Engine Bay)
Carb

Some people have placed the FPR before the filter and I don't see why.
It is my understanding is that if you use the Carter fuel pump, you should not need the regulator.
I read about that here
 
#16 ·
Okay thanks a lot everyone. I plan to go with the carter electric fuel pump and get a block off plate for the mechanical pump. I'm not sure about the pressure switch mentioned above. With a return line and a proper fuel pressure regulator I see no reason why the pump can't run any time the ignition is switched to "run". Unless the concern is in an accident when the lines may become disconnected from the engine. I guess the switch might not be a bad idea.
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top