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Fuel Pressure Restrictor Fitting

Arie

Arie

Well Known Member
Good day RV friends
Just a quick question, do you need a restrictor fitting in the fuel pressure hose going from the engine driven fuel pump to the fuel pressure sensor on a carburettor setup? I think it’s a good idea on a fuel injection engine with much higher fuel pressure ,but not so sure if it is needed on a carburettor setup with much lower fuel pressure ( I think round about 6 psi)
Regards
Arie
 
Arie said:
Good day RV friends
Just a quick question, do you need a restrictor fitting in the fuel pressure hose going from the engine driven fuel pump to the fuel pressure sensor on a carburettor setup? I think it’s a good idea on a fuel injection engine with much higher fuel pressure ,but not so sure if it is needed on a carburettor setup with much lower fuel pressure ( I think round about 6 psi)
Regards
Arie
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Absolutely. The thought of full-flow fuel (6 or 22-psi) blasting around in the cowling is not good. I'm sure you'll get other thoughts and opinions, but I've used custom restrictors. Drilled out AN rivet, etc.
 
Arie said:
Good day RV friends
Just a quick question, do you need a restrictor fitting in the fuel pressure hose going from the engine driven fuel pump to the fuel pressure sensor on a carburettor setup? I think it’s a good idea on a fuel injection engine with much higher fuel pressure ,but not so sure if it is needed on a carburettor setup with much lower fuel pressure ( I think round about 6 psi)
Regards
Arie
Click to expand...
Section 11 Construction Manual
FUEL PRESSURE GAUGE LINE
This should be a hose tapped into the fuel line somewhere between the fuel pump and the carb, and should be routed to a bulkhead fitting on the firewall, and then to the fuel pressure gauge. If an electric gauge is used, the sensor may be mounted on the firewall and connected to the fitting with a flexible line.
A Tee fitting on the "out" port of the fuel pump is a good source for the fuel pressure line. A restrictor fitting, like that described for the oil pressure line, should be used at the source end of the fuel pressure line.
 
As per the manual...the restrictor should be at the source end. The other end doesn't help in the case of a leak in the hose to the sensor. Same with the oil pressure line to the sensor.
 
Yes - remember it's the volume (quantity) of fluid that a restrictor restricts -- not the pressure of the fluid.
 
I would say you do not. The line to the pressure sender is only one of numerous fuel lines running around the engine area, all of which have a potential for leakage or breakage. Not sure you're really creating a whole bunch of additional safety here.

If you do not trust your fuel lines to not break, leak, or explode, best you find lines you do trust.
 
lr172 said:
I would say you do not. The line to the pressure sender is only one of numerous fuel lines running around the engine area, all of which have a potential for leakage or breakage. Not sure you're really creating a whole bunch of additional safety here.

If you do not trust your fuel lines to not break, leak, or explode, best you find lines you do trust.
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Speaking of hoses you dont trust, some of you fly some certified planes, Cessnas, Beech, Piper, etc. Got these in yesterday. YEP date code 4Q63, thats 1963. Master cylinder hoses on a Bonanza. Yep, rigor mortis set in about 30 years ago. LOL, you couldnt straighten them out with a press. No, we arent talking about fuel hoses, but I think brakes are pretty important too. We use the old rule of thumb for fuel and oil-- H8794 (303/111 hose) 8 years from the date code and its off. Most dont adhere to that until they have a failure. Ive seen tank hoses on Mooneys from the 60s with the original hoses. So---unsolicited advise here----next annual, of before, check them.
 

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TS Flightlines said:
Speaking of hoses you dont trust, some of you fly some certified planes, Cessnas, Beech, Piper, etc. Got these in yesterday. YEP date code 4Q63, thats 1963. Master cylinder hoses on a Bonanza. Yep, rigor mortis set in about 30 years ago. LOL, you couldnt straighten them out with a press. No, we arent talking about fuel hoses, but I think brakes are pretty important too. We use the old rule of thumb for fuel and oil-- H8794 (303/111 hose) 8 years from the date code and its off. Most dont adhere to that until they have a failure. Ive seen tank hoses on Mooneys from the 60s with the original hoses. So---unsolicited advise here----next annual, of before, check them.
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Not that you need more business, but that's a great idea. A database with hoses you've made and e-mail address.
It automatically notifies the owner of expiration and asks if they want replacements ordered.
Sorry for the thread drift.
 
wirejock said:
Not that you need more business, but that's a great idea. A database with hoses you've made and e-mail address.
It automatically notifies the owner of expiration and asks if they want replacements ordered.
Sorry for the thread drift.
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LOL Larry---everyone needs more business. The good thing about teflon is also a bad thing about teflon, its not life limited. But---its approved for repalcement on just about everything the originally had H8794 (303/111) or H5593 (306) hose. That covers alot of things.
 
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