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Mustang Technical Discussion > Pre 1973 > fuel pump > Community Forums > Mustang Forum Australia - Mustang Tech

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Cruzn65
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About a 15 months ago my existing electric fuel pump died and I replaced it with one of the no name brands to keep going. But I suspect now its starting to die.

I can see the glass filter I have mounted near the carb doesn't seem to have much fuel in it and where the engine would normally fire straight up it takes a few turns. This makes me think there isn't any fuel to fire the engine. I will check this before I jump in it next time.

It also cuts out at low rev which means I might need to adjust the idle on the carb.

Motor is stock 289 with Holley carb. Have checked rubbers and connections whilst engine is running which all appear fine.

If I had to replace the pump are there any recommendations out there? Or am I barking up the wrong tree? This is something I'd ask my dad, wish he was still about.


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boofhead
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Yes it might be the pump so other suggestions might send you down roads that were not necessary to travel. Having said that..

Could have the float(s) adjusted incorrectly or the float valve is sticking. A lot of Holleys use a rubber tipped float valve and I have found they stick quite often so I try to use brass only.

Having said that the fuel filter should be mostly full when the pump is running as air should get pushed out. It can reduce when not running as the fuel might flow back into the tank. The filter might be clogged though you should be ale to tell since it is glass.

Obviously the pump could be tired. As usual quality brands are better and where reliability is needed then it is often better to spend a little more. I have used both Holley Blues, Holley Reds and used Mr Gasket (which I am using as a lift pump in the mustang). There are other very capable brands around as well. Just make sure you not throwing to much pressure down the line to the carbi - needs only 6 psi so the pump needs and external regulator or an internal regulator.


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nassi
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I would have thought the fuel in the bowl would fire and run the engine. Does it start any easier if you just let the pump run for a few seconds before cranking?


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67fastysm
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so why have an electric fuel pump on a stock 289 not trying to be a smart A was just wondering what benefits against a good mechanical pump
cheers shane


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CobraJet
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Whilst a bit noisy the Carters are good value for money. Google the 4000 series and find one to suit your needs.


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boofhead
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Nassi hinted at the primary reason for an electric pump rather than a mechanical one - when you hit the ignition the pump starts and therefore fills the floats without having to crank the engine for a potentially extended period of time. This is really helpful when your car sits for long period as the fuel in the float bowel reduces/disappears over time. The secondary reason is that it provides even pressure while a mechanical pulses the fuel to a far greater extent. Again a minimal issue though it does allow improved conditions for the carbi to meter the fuel into the bowel. For a street car it is not important.


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hybrid
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Pull a hose and you will see if the pump is working.
If the bowl is full, your filter will not necessarily look full when the pump turns on.
Your pump should fill the bowl pretty quickly after turning on the ignition if it's not full already, so having to crank the engine a bit to make it start doesn't sound related to fuel pump.

To test you could leave the ignition on for 10 secs before you try and crank.


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Exhausted
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I've got a vacuum / pressure tester at the workshop if you want to check output. Also got a new pump & regulator ... unused.


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Cruzn65
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67fastysm wrote
so why have an electric fuel pump on a stock 289 not trying to be a smart A was just wondering what benefits against a good mechanical pump
cheers shane


In this case the car has been converted to RHD and has aircon/power steering. The side that the mechanical pump would sit on is pretty crowded so I gather the electric unit was installed way back when.

My project car has the mechanical pump and the old girl fires up after sitting for weeks after a few turns of the motor. Its very reliable.


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Cruzn65
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Exhausted wrote
I've got a vacuum / pressure tester at the workshop if you want to check output. Also got a new pump & regulator ... unused.


Sounds like I should stop by the one stop shop Pete Smile will you be about Saturday morn?

Im not hearing the pump rattling away like it used to especially when I turn on the ignition. Normal first time every time cold start procedure is;-
    turn ignition on listen for pump wait 3-5 sec pump accelerator twice turn key BANG fires up


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Exhausted
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I'll be in about 9.30 until 1 ish. Working on the effie brakes & steering mods.


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67fastysm
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thanks boofhead question answered


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Cruzn65
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Exhausted wrote
I'll be in about 9.30 until 1 ish. Working on the effie brakes & steering mods.


See you about 9.30 will bring a coffee for you Pete Drink


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mikes68
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Cruzn65 wrote
Exhausted wrote
I'll be in about 9.30 until 1 ish. Working on the effie brakes & steering mods.


See you about 9.30 will bring a coffee for you Pete Drink


See ya there guys... Got a couple old tyres to pick up and clear out of Petes way!


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Exhausted
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Flat white, no sugar ..


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