What have you done to your square lately??

[83Burban]

Anybody consider a frame mounted inline electric pump like a Delphi HFP950?

They're suitable for carburetors since they only make about 5 psi. You can probably connect it through a pressure switch to regulate it if necessary, and then you don't have to go through any tank gymnastics to change it if it quits.

No, i have not. I'll check them out.

Ive got a Holley fuel by-pass regulator on the way. So.....so as long as it makes at least 5.5psi I should have no issues.

 

[83Burban]

@Blue Ox

Can you use diesel pumps with gasoline? It kinda just looks like a cheaper version of the Mr Gasket / Eddy pumps that we are talking about

 

[Blue Ox]

@Blue Ox

Can you use diesel pumps with gasoline? It kinda just looks like a cheaper version of the Mr Gasket / Eddy pumps that we are talking about

I use them a lot for transferring gasoline and the only time one failed was when it was left unattended and ran dry. No, I was not the operator.

I can ask Delphi if there's any issues, but there's no warnings in the paperwork so I doubt if it's a problem.

 

[Vbb199]

Just remember, alot of those pumps are designed to push, not pull, so make sure theyre relatively close to the fuel tank

 

[Grit dog]

Anybody consider a frame mounted inline electric pump like a Delphi HFP950?

They're suitable for carburetors since they only make about 5 psi. You can probably connect it through a pressure switch to regulate it if necessary, and then you don't have to go through any tank gymnastics to change it if it quits.

Just looked it up. Looks basically like the pump I have, except would need hose adapters.
Maybe more reliable? Several smart people told me those pumps don’t live long pulling fuel a long ways. They’re pushers and ideally gravity or at least siphon fed (lower than pickup). Will see how long it lasts.
If I knew this engine was staying in it forever or was planning on EFI, I’d replace them now.

 

[Grit dog]

Why do you prefer a mechanical to the in-tank route? I'm still learning theory behind all of these systems and am genuinely curious.

Tbh......i think I'm more likely to go the in-tank route. My reasoning is that i'm kind of considering swapping the carb for an EFI set up. Pretty sure I would have to go back to an electric pump if I do end up doing this. The fancy Holley unit requires some 58psi.

This thing needs to be daily drivable and get better than 5mpg (like she is). I'm driving her for work. Already yanked the eddy 750 off and went to a 600. I do believe 750 is EXCESSIVE for an unbuilt motor.

I do have access to a lift and all the fancy tools you could ever want....so dropping the tank is not quite as much of a suck fest. Ive also got zero adversion to "installing" a service hatch for ease of future repairs. This truck has been molested every which way....so it cant "hurt" the value.

In your case it makes sense to fix it right and fix it once if it’s a daily and your planning on efi soon.
Although I wonder if there’s an in tank pump avail that puts out enough pressure for the what you need since squares never came with Vortec efi engines. You may need an inline pump anyway because of that and the options are numerous.

Mech pumps imo are simple, cheap and reliable. No pressure reg needed. No disadvantages on a carb setup. Just something that doesn’t need to be more complicated unless there’s a reason.

 

[Grit dog]

@83Burban
I’m interested to hear how the 600 does performance and mileage. Have a 750 Edelbrock on mine that came with it.
Runs great, but gets 6-7 mpg tops I’m guessing?
I definitely drinks gas and just driving around locally. Not much highway driving.

 

[Vbb199]

In your case it makes sense to fix it right and fix it once if it’s a daily and your planning on efi soon.
Although I wonder if there’s an in tank pump avail that puts out enough pressure for the what you need since squares never came with Vortec efi engines. You may need an inline pump anyway because of that and the options are numerous.

Mech pumps imo are simple, cheap and reliable. No pressure reg needed. No disadvantages on a carb setup. Just something that doesn’t need to be more complicated unless there’s a reason.

87-91 baffeled fuel tank for a suburban or k5, with a 87-91 sending unit, with an acdelco ep381 fuel pump (fits direct in the 87-91 sender), no aftermarket tanks, playing with resistances on senders for fuel floats, and not to mention, it keeps it looking original

(If its for a burb or k5), in the instance of a pickup, apparently you need a 1987 c10 baffled saddle tank with a 1987 sending unit for the 1 year only tbi pickup

Thank @Bextreme04 for that last bit of info

 

[Grit dog]

^Love the knowledge here!
Well, there’s your setup @83Burban !

 

[Vbb199]

^Love the knowledge here!
Well, there’s your setup @83Burban !

If he can source it, he can even use TBI fuel lines (braided at the endes), and just run adapters to go from the 16mm and 14mm tbi lines to whatever input is on the fuel injection unit... for my holley efi, its 16 and 14mm to 6an fittings, fragola adapters.


Im running tbi lines on my c10, i just cut them down to run to the saddle tank and reflared the ends with unions and tube nuts. Pulled them right off my k5.

 

[mcarlo86]

@83Burban
I’m interested to hear how the 600 does performance and mileage. Have a 750 Edelbrock on mine that came with it.
Runs great, but gets 6-7 mpg tops I’m guessing?
I definitely drinks gas and just driving around locally. Not much highway driving.

Ever consider putting a Qjet back on it? The small primaries are good for throttle response and better economy when driving around town and then the big secondaries are there when you need the power. I have a Qjet on my 454 powered motorhome and it gets 7-8 mpg pushing that 10,000 lb pig down the road. I would think 10-12 should be attainable in a pickup with a Qjet.

 

[Grit dog]

^ I have. Because this one has a drinking problem...
There’s about 40 things still on the **** to do to the square list. And it’s hovering around the #30 position! Lol

 

[Grit dog]

What have I done to my square lately?
Not a damn thing....
Too much life getting in the way of truck restoration!
But I do believe the bondo can only needs to be opened one more time between now and paint. So that’s progress I suppose!

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[83Burban]

Ever consider putting a Qjet back on it? The small primaries are good for throttle response and better economy when driving around town and then the big secondaries are there when you need the power. I have a Qjet on my 454 powered motorhome and it gets 7-8 mpg pushing that 10,000 lb pig down the road. I would think 10-12 should be attainable in a pickup with a Qjet.

I think the 454 Qjet is a 600cfm carb. But I could be wrong.

On the 750 the primary / secondary apear identical. The 600 has significantly smaller primaries but secondaries seem to be the same size as the 750.

Ive found its best if you are not giving it a full pump shot and its really easy to adjust the acceleration pump on the eddy carbs. If your engine is not "built" a full shot is likely lugging your motor. Or thats at least how it seems.

 

[Vbb199]

Very primitive.... but it IS b-rate hillbilly customs tho
...


Got the "dummy trans" bolted up (gutted 400 with a damaged case)

So now i can check my driveshaft length, AND get an idea for how the crossmember is gonna work!

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