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914 Fuel Pump Assembly Pressure Testing

  • cmaiman
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2 weeks 1 day ago #23077 by cmaiman
Hi,

I understand to test the fuel pump assembly (on the bench) you close off the outlet and attach a differential pressure gauge on the inlet.

What is the proper testing pressure? My kit company (The Airplane Factory) says 1.8 bar (26 psi), but I want to make sure that's the right number.

Thanks,

Craig

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2 weeks 1 day ago #23088 by Bill Hertzel
Replied by Bill Hertzel on topic 914 Fuel Pump Assembly Pressure Testing
If the Manifold pressure goes to 40" Hg (~20psi) then 26 psi will be plenty to still push fuel into the cabs with a few psi to spare.
You will only be pushing that pressure limit when you are approaching the vacuum of space.
If you keep it below 20,000ft you will only need ~15psi to move the fuel.

Look up the manufacturer and model number stamped into the side of the pump to see the specs of what you actually have.
1.85 bar is a common static pressure while still delivering 40L/h at 1.6 bar for medium pressure pumps.

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
whertzel1@yahoo.com
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2 weeks 18 hours ago #23091 by cmaiman
Replied by cmaiman on topic 914 Fuel Pump Assembly Pressure Testing
Hi Bill,
Thanks for the reply. I'll go with the 1.85 bar as that seems to be the consensus of what I've been reading.
I actually did try to look up info about that pump (it's a TI Automotive), but had no luck finding it on their website.
Craig

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2 weeks 14 hours ago - 2 weeks 14 hours ago #23093 by Bill Hertzel
Replied by Bill Hertzel on topic 914 Fuel Pump Assembly Pressure Testing

cmaiman wrote: ...I actually did try to look up info about that pump (it's a TI Automotive), but had no luck finding it on their website...


"TI" is the name "Walbro" uses in foreign markets...
They probably use the same numbers.

What numbers are on the pump?

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
whertzel1@yahoo.com
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Last edit: 2 weeks 14 hours ago by Bill Hertzel.

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2 weeks 14 hours ago #23095 by cmaiman
Replied by cmaiman on topic 914 Fuel Pump Assembly Pressure Testing
Bill,

I've attached a close photo of the side with all the numbers. The other side just says "TI Automotive". I couldn't find it on their website.

Craig

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2 weeks 13 hours ago #23096 by Bill Hertzel
Replied by Bill Hertzel on topic 914 Fuel Pump Assembly Pressure Testing
That is a Pierburg Model E1F-7.21440.78. --- 1.85 bar

www.pierburg-service.de/ximages/pg_pi_0034a_en_web.pdf

TI = Walbro(USA) = Pierburgh(Germany)= House-Rebrand Pump

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
whertzel1@yahoo.com
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2 weeks 12 hours ago #23097 by cmaiman
Replied by cmaiman on topic 914 Fuel Pump Assembly Pressure Testing
Wow, that's it! Thank you so much Bill! So, 1.85 bar it is! Will test soon.

Thanks,

Craig

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2 weeks 9 hours ago - 2 weeks 9 hours ago #23100 by Bill Hertzel
Replied by Bill Hertzel on topic 914 Fuel Pump Assembly Pressure Testing
If you ever need another, it was used on the Renault 5 Turbo GT among others.
<$100 as an auto part or ~$350 as an Aircraft part.

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
whertzel1@yahoo.com
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Last edit: 2 weeks 9 hours ago by Bill Hertzel.

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2 weeks 8 hours ago #23101 by cmaiman
Replied by cmaiman on topic 914 Fuel Pump Assembly Pressure Testing
Bill,

Were you a detective in a previous life? ;-)

Thanks!,

Craig

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