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Author Topic: inline pump question  (Read 2737 times)

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Offline biggrgivens

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inline pump question
« on: November 20, 2014, 01:38:52 AM »
I installed a inline walbro 190lph fuel pump and I have two questions. 1) When I turn the key to on position, I can hear the fuel pump run constant, however when I turn on the turn signals, I can hear the pump increase and decrease as the flasher operates. Does this mean its going to a bad power source and should I find another power source for pump?

2) I mounted the pump above the tank area. Car was originally a carbed car, so no pump in tank. Is it true that pump needs to be mounted in a area below the tank?

Offline Wittsend

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Re: inline pump question
« Reply #1 on: November 21, 2014, 11:20:17 AM »
Something is drawing the power when the signals flash for sure.  The factory setup uses a relay. I assume you are drawing power through the ignition switch?  Just wire in a relay. That will likely solve the problem.

  Also, do you have the fuel shut-off switch? Just asking because it is wise to use one.  Just about any Ford of the injected era will have one mounted in the trunk.

As to the pump placement, I'm including a picture of mine.  I have no issues other than I'd prefer it higher for clearance reasons (though it has not been a problem scraping anything). The pump looks lower than it really is. It is roughly even with the bottom of the rear floor well.  The area it is bolted to is the raised area under the rear seat.

Offline 65ShelbyClone

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Re: inline pump question
« Reply #2 on: November 21, 2014, 12:56:59 PM »
This is just copypasta of my reply on Turboford since not all PCCA members may venture over there.

Quote from: 65Shelbyclone
What's your system voltage at idle? does it fluctuate when the signals are on? Do the headlights dim with them too? Are you using the original Pinto alternator?

I have 14.0-14.2v all the time, but I'm also running a 130A 3G.

Two thoughts on the pump location:
1.) EFI pumps are said to be bad at lifting fuel. If it's cavitating on the inlet side, mounting it lower may help.

2.) If it ever pulls enough air to lose prime, that's it; it won't have enough pull to prime itself. That could be a big PITA if it happens on the road.

I mounted my pump on a DIY bracket/bash plate under the passenger side rear seat. It's slightly above the lowest part of the floor and the inlets are within 2in of the tank bottom. I also wired the rear of the car with an extra power lead for a future lift pump and surge tank.

I'll add that I am using '86 'Bird fuel pump wiring with the relay and inertia switch behind the driver's side rear marker light (under the plastic interior panel). I put a fuse block under the dash and pulled +12v from there. The fuse block gets energized by an ECU-controlled main power relay under the hood. The fuel pump is grounded to the chassis, but I ran a spare (and thusfar unused) ground up under the dash as a backup.
'72 Runabout - 2.3T, T5, MegaSquirt-II, 8", 5-lugs, big brakes.
'68 Mustang - Built roller 302, Toploader, 9", etc.