Fuel pump ?'s
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Fuel pump ?'s
I have a 91 f250 with a 7.3 IDI. I have turned the pump up about 1/6 th of a turn, cut the soup bowl out and put a free flow exhaust in it. Now when I stomp the gas just to rev it it spits black smoke(normal) followed by a little bit of white smoke(problem). I have been told that this could be timing. I have also been told that I need to get more fuel to the engine and to buy an in line fuel pump. I just installed a 6-9 psi 30 gal per hour pump and it was not strong enough. Which would be my problem? And if I should get an in-line fuel pump what ratings should I need.
Hotshot
Joined: Feb 2004
Posts: 11,697
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From: Marengo, Iowa
30 gph isn't quite enough. What else did you do to the intake? If you are still hooking the hose to the factory section on the frame, that needs to be modified, it is too small and restrictive. You also may have gone too far with the fuel screw, a little is a lot. When we talk about adjustment, we talk about flats of the hex, a 1/4 to 1/2 of a flat increments is the recommended amount each time, you likely overshot that, and have too much perhaps. If it only does it when just stomping on it, it isn't as serious, but personally, I don't want a lot. I get black when I stomp it, but a light haze when working it on the road, clear when running normal. I would prefer no smoke usually, but it pulls too damn nice to eliminate it all. Turbo is in the hopes, but the cash flow has to be there first.
What size exhaust are you running? I switched mine to a 3.25, built it myself, and recently completed my intake modification so I am now drawing through a 4" pipe right off the grille.Factory is way smaller, and draws behind the headlight, with part of the structure blocking that as well.
What size exhaust are you running? I switched mine to a 3.25, built it myself, and recently completed my intake modification so I am now drawing through a 4" pipe right off the grille.Factory is way smaller, and draws behind the headlight, with part of the structure blocking that as well.
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fellro, he said he has an f350 idi, isnt that a turbo, so you would have no "soup bowl" am I way off here? I thought idi(indirect injection) meant it's a turbo!? Anyway I have a 93 350 c/c turbo can I just take the thin plastic intake (at the hood space) off to get more air? Sorry to rip you thread redneck! You spiked my interest!
Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
No IDI was turbo from the factory till 93 in any F series.
As for the electric fuel pump, several people here have reported good results with a Holley Red fuel pump, if you install one you should eliminate the stock lift pump.
Eliminating the stock Ford intake over the battery will help, but unless you duct in cool air from the grill area you may not see much improvement.
As for the electric fuel pump, several people here have reported good results with a Holley Red fuel pump, if you install one you should eliminate the stock lift pump.
Eliminating the stock Ford intake over the battery will help, but unless you duct in cool air from the grill area you may not see much improvement.
Hotshot
Joined: Feb 2004
Posts: 11,697
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From: Marengo, Iowa
Just being in a 350 does not guarantee a turbo. If it is turbo though, then it wouldn't have the soupbowl. IDI means it is indirect injected, nothing more. Some are turbo'd, some are not. It is strictly a reference to the injection and combustion style.
You can take that off, but the bet thing to do is replumb it to get air from the grille, or Hypermax sells a scoop and kit to make it draw from the cowl.
Turbos were an option available in 93, but not a standard. Not every 93 350 will have the turbo option. Some 250's had them as well, but not all.
A quick side note on the IDI meaning turbo, my 86 and my dad's 84's are not turbo'd at least not yet, and were such from the factory. You will not find a powerstroke without a turbo though...
You can take that off, but the bet thing to do is replumb it to get air from the grille, or Hypermax sells a scoop and kit to make it draw from the cowl.
Turbos were an option available in 93, but not a standard. Not every 93 350 will have the turbo option. Some 250's had them as well, but not all.
A quick side note on the IDI meaning turbo, my 86 and my dad's 84's are not turbo'd at least not yet, and were such from the factory. You will not find a powerstroke without a turbo though...
Last edited by fellro86; Sep 13, 2007 at 10:52 AM.
Hotshot
Joined: Feb 2004
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From: Marengo, Iowa
Looks like we were posting at the same time Dave... Anyway, I run the Holley red as well, and it does work pretty nice, and no more dry cranking to get the filter filled up again. I can't say it made a lot of difference in power, but it has been more convenient. I got more from the exhaust and intake changes.
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wow, thanks for clearing that up guys! I've learned sooo much (almost too much)from this site! My truck is BACK in the shop for the fuel leak again! I had to find the leak myself as they've had the truck two different times and said they couldn't find a leak(he actually said that older fords don't burn the fuel(sorry, diesel) completely and that's why I smell diesel! Yeah right, I smell RAW diesel, anyway, I found the leak at the passenger side closest to the firewall at the injector( after they just replaced the o-rings for 550 bucks! So maybe they'll finish today. Needless to say I won't go to them again, although they said if it still leaks, they would replace everything again!
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Hotshot
Joined: Feb 2004
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From: Marengo, Iowa
They burn the fuel just as completely as the newer ones, and ANY raw fuel out the tail pipe is bad.. They sure soaked you for the injector returns, $25-30 in parts, not that much labor really.They should have replaced the caps, lines and o-rings at the same time, that is part of the parts price I stated. Many newer shops haven't worked with the older diesels, and have no clue about them. You would be better served to find a shop that has been doing diesels for over 10-15 years, so they would be familiar with the older ones, not just the newer computer controlled versions.
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Raw fuel smell was from the leak, no raw smell from the exhaust(thank god)I will ask them when I pick up the truck why the price was so high for the o rings!they did new radiator doces with flush, alignment with tie rod ends, fuel filter, oil change,and new return lines, and replaced the rubber elbow to the turbo(big crack) for 1770 bucks right after I bought it for 6500! 93 350 c/c turbo 126k white longbed. I love the truck, I just can't wait to get all the probs fixed!
Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
I am in the wrong business.
At 550 for O rings, I could have replaced the entire engine return line system, paid for the parts and made over 300 dollars an hour.
If I just did O rings, that number would have been 520 an hour.
You must have rather expensive shop rates in your neck of the woods.
If you don't mind getting very black diesel oil on you and you have any mechanical ability at all, you need to get a few tools.
We can save you a pile of money.
At those rates, you can pay for a rather big tool chest full of tools and still be ahead of going to the garage once or twice.
At 550 for O rings, I could have replaced the entire engine return line system, paid for the parts and made over 300 dollars an hour.
If I just did O rings, that number would have been 520 an hour.
You must have rather expensive shop rates in your neck of the woods.
If you don't mind getting very black diesel oil on you and you have any mechanical ability at all, you need to get a few tools.
We can save you a pile of money.
At those rates, you can pay for a rather big tool chest full of tools and still be ahead of going to the garage once or twice.
Last edited by Dave Sponaugle; Sep 13, 2007 at 05:39 PM.
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Junior User
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Thanks for everything guys I still didn't get the rates on the fuel pump though. So what about the timing I haven't touched it though so it shouldn't be retarted at all should it? The fuel was turned about half a flat i think(I put the allen wrench in facing up towards the sky and turned it clockwise to face the radiator) Other than that I think that ya'll have answered all of my questions. If I have anything else I'll holler. This place is so much more informative than the blank stares i get from mechanics when I say idi diesel.
Hotshot
Joined: Feb 2004
Posts: 11,697
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From: Marengo, Iowa
You of course would have to put a scoop on. I think it has been done by someone on here, but can't recall for sure if it was here or another forum. It all depends on how you would want to do it, have a hose hookup, or have the hood come down and seal to it.