91 K5 383 Fuel Pump Question

[bensk5]

Before I ask, YES I searched here and on thirdgen for my question, to no avail.

I am almost done converting my 91 K5 to a carb'd 383 from the 350 "K" motor.
I do know that the stock TBI setup operates at a 9-14 Psi range depending on condition and miles. My question is, does anybody know what the stock in tank pump is rated for pressure wise? I have a few ideas regarding the pump and may be able to incorporate it into my build. From the info I did find from other threads I found anywhere from (15-18) psi?? Ca

If anybody can advise on this question it would greatly be appreciated.

Ben

 

[Fordum]

Well, I can't help either right off the top of my head. I'm not sure I have ever even seen that information.
I do know I have seen where others have tried to use an in-tank pump for a carb., and I assume it worked eventually.
Problem is, we mostly hear about stuff that does not work.

However, as I'm sure you know, the regulators in the FI systems are bypass regs as far as I know.
Which means that the in-tank pump never sees a deadhead. Any flow and pressure just gets bypassed into the tank.
Engine mounted pumps, and the small electric in-line pumps are designed to handle no flow situations.
I'm not sure if the in-tank ones will.

So, if you do adapt it, you need to find a bypass regulator unless you can find where someone has made it work.

If no one else jumps in after a while, try reposting it with a more descriptive title. Like: " Will an in-tank fuel pump work on a carb" or something like that.

 

[ryoken]

you can check the deadhead pressure by clamping the return line and turning the key on with a gauge in the system... I just checked one of mine, it had 14.5 psi...

 

[nvrenuf]

Mine will max out a 15 psi gauge. I put a regulator on it and run it right at 8 psi with no problems.

Edit: be sure to run a return style regulator to keep the pump happy.

 

[bensk5]

Thanks guys for all the reply's.

 

[smier]

I was told our pumps are rated at 15 psi, and remember someone testing their pump by disconnecting at the filter mount on the frame rail and getting a reading of 15 psi...

So what made you decide to ditch the TBI system?

 

[bensk5]

So what made you decide to ditch the TBI system?

Decided to ditch because they are inefficent systems that choke the potential of the motor as fas as I am concerned. I will be going EFI soon with the new MSD system on the market. This new carb setup & 383 im doing is a temporary fix untill I figure out what forced induction setup I will be using along with the MSD unit.

I have owned this K5 for 2 months and have pretty much gone through everything on it. Paint and interior is next.

 

[smier]

Seems rather ambitious, what type of rig are you building? I understand your concerns if you were building a 1/4 mile drag car... Now you have me curious.

 

[bensk5]

Seems rather ambitious, what type of rig are you building? I understand your concerns if you were building a 1/4 mile drag car... Now you have me curious.

My rig will see 70% street and 30% dirt/mud. Usually when I build something its usually a " All Show All Go" kind of ride. And when it goes offroad I will NOT be kind to it. Its already got a 14bff and 10b 3/4 ton which will be switched out for a Dana 60 from Boyce Equipment. The motor ambitions are on the overkill side, but when we broke the engine in on the dyno it made 386fwhp and 447lbft tq. I just want more. When I had it all apart, I Built the hell out of the 700r4 and rebuilt the transfercase for what was to come. Had all new U joints put in on driveshafts etc. for what was to come.

And funny you say 1/4 mile drag car.....Thats my usual cup o' tea