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Fuel pressure regulator??

  
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Fuel pressure regulator??

 
gordo84 gordo84
User | Posts: 145 | Joined: 11/10
Posted: 05/29/11
05:43 PM

I have a fuel pressure regulator available from work.. quite cheap. It is a non return style with one in and one maybe 2 outlets. Is it possible to use this with an electric pump to dial down fuel pressure for a carb.. provided you put a " T " in the line directly before the pump. Then plumb the "t" to the return line. Will this work?? Thanks for the help from all you folks.  

waynep7122 waynep7122
Guru | Posts: 1130 | Joined: 08/09
Posted: 05/29/11
09:27 PM

in tank fuel pumps do not have internal bypass valves...

they DON"T like being deadheaded....

a non return fuel pressure regulator will dead head the pump...

you do have the ability to pick up something like a fuel pressure regulator off a volvo 164e from 74 or 75 install that in the line back by the tank..   some units had an adjustment bolt... so you should be able to drop the line pressure even lower..  while preserving the intank high pressure fuel pumps... this one will still be too high for a TBI in tank fuel pump...

depending on what you have in the tank..  there are low pressure intank fuel pumps that will retro fit many intank units..  and have only 4 to 6 psi output..



this is under 50 bucks in some stores.. sometimes even less..  please use one of the many strainers available..

Part Number: E3903
Weight: 0.4 lbs
Warranty: 1 YR
OEM Brand: Automotive Accessory
Gaskets Included: Yes
Inlet Attachment: Inlet-Strainer
Inlet Count: 1
Installation Hardware Included: Yes
Maximum Free Flow Rate (gph): 35
Maximum Pressure Range (psi): 5
Minimum Free Flow Rate (gph): 20
Minimum Pressure Range (psi): 3
OEM Part Number: 25115110, 25115461, 6472408
Outlet Attachment: Outlet-HoseConnection
Outlet Count: 1
Outlet Size: Outlet - 3/8
Package Contents: Pump and Kit  

waynep7122 waynep7122
Guru | Posts: 1130 | Joined: 08/09
Posted: 05/29/11
09:44 PM

the above pump is shorter than the existing pump.. but where it fits into the bottom of the bracket should not effect the installed height of the strainer  in the tank...   the hose from the end of the pick up tube to the top of the pump will be longer is all....


this pump should be an easy install on most conventional fuel sending units.. with a proper strainer on the bottom..

along with some creativity for passing the wires through insulators installed in the sending unit flange...  

gordo84 gordo84
User | Posts: 145 | Joined: 11/10
Posted: 05/30/11
01:50 AM

Im not sure i compleatly understand what "deadheading" is  

gordo84 gordo84
User | Posts: 145 | Joined: 11/10
Posted: 05/30/11
01:58 AM

If its a buildup of pressure as i assume it is, wont the "t" remove that?  

TNFrank9 TNFrank9
New User | Posts: 25 | Joined: 05/11
Posted: 05/30/11
07:10 AM

Most returns are smaller then the actual fuel line, a "T" would be the same size so I'm not sure if it'd work or not.  You could always sump your take and get an external fuel pump. Just make sure you get the special in take fuel line to use to sump it, stuff is expensive but it's a must as it won't turn to mush inside your take when exposed to gas. I'm running a sump with a Holley Red external pump, no return, no pressure regulator needed(with a Holley carb) since it's only a 7psi pump. If you're running a carb other then a Holley then you might need to still regulate it down to around 4psi.  
'96 S10, V8 swap.

gordo84 gordo84
User | Posts: 145 | Joined: 11/10
Posted: 07/12/11
01:49 PM

I got a regulator procomp carp number 2851. It is one in and 2 outlet. I dont believe however it is return style.  

redneckjoe69 redneckjoe69
Addict | Posts: 2337 | Joined: 03/10
Posted: 07/12/11
02:04 PM

2 out sounds like it could be return style.?   is one output size smaller?   a T before the regulater will work for a return.   make sure you use a fuel pressure gauge before the carb.  

68scott385 68scott385
Guru | Posts: 1990 | Joined: 10/09
Posted: 07/12/11
02:22 PM

+1

The idea is to let fuel flow, keep the pump from working against a bottleneck.  
68scott385 68scott385 68scott385

gordo84 gordo84
User | Posts: 145 | Joined: 11/10
Posted: 07/12/11
03:19 PM

It has one inlet and two out, if i hook one out to the carb and the other to the return line, will the fuel take the path of least resistance? or will it distribute an even amount down each line at the set pressure?  

68scott385 68scott385
Guru | Posts: 1990 | Joined: 10/09
Posted: 07/12/11
05:09 PM

Run a smaller return line than the line to the carb and it should be fine.  
68scott385 68scott385 68scott385

skyeking skyeking
Addict | Posts: 2738 | Joined: 08/09
Posted: 07/12/11
05:16 PM

Hi there,
 Some regulators can be fitted with a pressure gauge which some

 carbys cannot accomodate on other style of car engines..  
skyeking

gordo84 gordo84
User | Posts: 145 | Joined: 11/10
Posted: 07/13/11
04:55 PM

Does anyone know what the feed and return line sizes are on a 1990 c1500?  

redneckjoe69 redneckjoe69
Addict | Posts: 2337 | Joined: 03/10
Posted: 07/13/11
07:57 PM

i would guess 3/8 to the regulator,....1/4 return.     the gauge AFTER the regulater is your fuel pressure.    idk what you bought, but most return style regulaters are about $80.oo.    lucky to get a year out of it.    why?     they put a strain on the e-fuel pump.    keep it free flowing with the T before it, or run a mechanical pump with an old-school pick-up.   jmo.  

gordo84 gordo84
User | Posts: 145 | Joined: 11/10
Posted: 07/14/11
08:25 AM

I figure Ill connect one outlet to the return.. pinch off the return line some.. get the pressure to aprox 10 psi at the carb.. then dial it down to 6ish. Sound right? One gent suggested putting an old carb jet in the return line to keep the main feed pressure up.  

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